Answer:
How Biogeography Affects Biodiversity
Alfred Russel Wallace, Father of Biogeography
Figure 1: Alfred Russel Wallace, Father of Biogeography
Some places contain more species than others. For example, Antarctica has fewer species than a temperate deciduous forest, which in turn has fewer species a tropical rainforest. For over 150 years, researchers have sought to make sense of the gross and fine scale spatial patterns in biodiversity, and to elucidate both the proximate and ultimate causes for these patterns.
This article describes some of the major geographic patterns in species richness, and the processes and theories that are thought to account for these patterns. Much of this knowledge has emerged from the tremendous body of work from one scientist, Alfred Russel Wallace (Figure 1), widely regarded as the “Father of Biogeography.” Aside from co-originating the process of Natural Selection with Charles Darwin, Wallace spent extended periods studying the distribution and diversity of plants and animals in Amazonia and Southeast Asia in the mid 1800s. Many of the patterns and processes featured in this article were initially described by Wallace, and careful study of his work indicates that his ideas presaged many of the discoveries made by his numerous successors.
Many of the spatial patterns in biodiversity are overt, others are subtle and yet additional patterns remain undetected. While the existence of these patterns may be obvious — and changes in the environment that are paired with these patterns may also be obvious — the mechanisms that cause the differences in biodiversity along environmental gradients are under still the subject of scientific debate. Because large-scale patterns are the emergent result of complex interactions at many spatial and temporal scales, no single answer is likely to ever emerge, but with continued research our understanding of the processes shaping these patterns increases.
Historical Processes Affecting Biogeography
Darwin's finches of the Galapagos Islands are a classic example of adaptive radiation.
Figure 2: Darwin's finches of the Galapagos Islands are a classic example of adaptive radiation.
All species occurring in at a given place and time either arrived from another place or originated in that location from ancestral species. This fact applies to extinct species that were ancestors of all extant species. Species richness in a given location is the result of three factors — the rate of speciation, the rate of extinction, and the dispersal of species from other locations. In principle, if biogeographers could understand how the current and past environment has shaped these three factors, we would then obtain a comprehensive understanding of what generates all biogeographic patterns of species richness. However, numerous environmental and organismal parameters can drive these historical factors, in both complex and interacting fashions.
in which group are the alkaline earth metals found?
I NEED HELP SO BAD MY TEACHER IS STARING AT ME
Imagine that a disorder that causes the cell cycle to stop affects the muscle cells of a frog’s leg. What consequence is most likely to follow?
A.The frog will immediately not be able to use the muscle.
B. An injury to the muscle will not heal.
C. The frog will not be able to reproduce.
D. A broken bone in that leg will not mend.
D .. A BROCKEN BONE IN THAT LEG WILL NOT MEND
There are 18 daisies in a 0.25 m² area. How many daisies might there be in a 1.0 m² area?
Answer:
72
Explanation:
0.25 X4 =1.0 so
18x4=72
The genetic code tells cells how to make proteins.
TRUE
FALSE
Check it
Answer:
false
Explanation:
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PLEASE HELP!!!!!
Which of the following is NOT likely to be an outcome of building more wind and solar farms?
A: an increase in air temperature
B: an increase in rain
C: a change in wind path
D: a decrease in farming output
Answer: B: an increase in rain
Explanation:
Answer:
an increase in rain
Explanation:
In eukaryotes, gene expression is regulated mostly by _____.
Answer:
Gene expression in eukaryotic cells is regulated by repressors as well as by transcriptional activators. Like their prokaryotic counterparts, eukaryotic repressors bind to specific DNA sequences and inhibit transcription.
Explanation:
In eukaryotes, gene expression is regulated mostly by transcription factors.
What are transcription factors?Transcription factors are proteins that bind to DNA in the promoter region of a gene, and they play a critical role in controlling when and to what extent a gene is expressed.
They can either activate or repress gene expression by promoting or inhibiting the recruitment of RNA polymerase. Transcription factors are themselves regulated by a variety of signals, including hormones, growth factors, and other external cues, as well as by feedback loops and other regulatory mechanisms within the cell.
Ultimately, this complex interplay of factors allows eukaryotic cells to precisely control which genes are expressed, when they are expressed, and to what degree, enabling them to respond to changing internal and external environments.
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correct choice???
bio
Answer:
solvent
Explanation:
the solvent is the substance in which the solute dissolves
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The Correct choice is :
Solventwhich muscle group relates best with the term midline?
The oblique is the muscle group that best relates with the term midline.
The anterolateral abdominal wall contains a muscle group in which there are flat muscles whose fibers originate in the posterolateral part, pass forward and become an aponeurosis towards the midline:
The external oblique muscle is the thickest and most superficial of the three muscles on the lateral wall of the abdomen.It follows an inferomedial direction and the muscle-tendon limit descends in such a way that, towards the midline and also below the height of the anterior superior iliac spine, it is completely transformed into an aponeurosis.The aponeurosis of the external oblique joins that of the internal oblique and passes in front of the rectus abdominis; its fibers intersect in the midline with those on the opposite side and contribute to the linea alba.
Therefore, we can conclude that the oblique is the muscle group that best relates with the term midline.
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What is the Greek name for each of the spheres?
Answer:
stone (litho) or ground (geo)
air or vapor (atmo)
water (hydro)
life (bio).
Explanation:
What are all living things made of?
Answer:
All living organisms are made up of one or more cells, which are considered the fundamental units of life. Even unicellular organisms are complex! Inside each cell, atoms make up molecules, which make up cell organelles and structures. In multicellular organisms, similar cells form tissues.
Explanation:
Answer:
Cells!
Explanation:
The cell theory states that...
-Cells are the building blocks of life
-All living organisms are composed of one or more cells.
-All cells come from pre-existing cells
which term refers to distention of the renal calyces and pelvis?
Answer:
Hydronephrosis refers to distention of the renal calyces and pelvis of one or both kidneys by urine. Hydronephrosis is not a disease but a physical result of urinary blockage that may occur at the level of the kidney, ureters, bladder, or urethra.
Explanation:
biology definitions i wrote down
can you guys please help me. this is my last one
you guys can just do 3 sentences
please don't put any links or I will report you
Answer:
why don't you want people to send you links?
Pls help!
Explain how Community 1 and Community 2 compare with regards to species richness
(number of species)?
Explain how Community 1 and Community 2 compare with regards to species evenness
(proportion of each species)?
I need to see whole picture to help
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máu là Mô liên kết!!!!!!!!!!!!!!!!!!!!!!!
The cell membrane is a unique structure that has many functions.
How is the cell membrane involved in riding the body of bacteria,
allowing water to enter the cell, and export material out of the cell?
Answer:
The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.
Explanation:
What is the function of the genetic material in the cell
Answer:
DNA serves two important cellular functions: It is the genetic material passed from parent to offspring and it serves as the information to direct and regulate the construction of the proteins necessary for the cell to perform all of its functions.
Explanation:
What are silver carp strengths and weaknesses?
In living organisms the cell
cycle is closely regulated.
What do you think will
happen if cell division is not
controlled?
Answer:
Explanation:
Disruption of normal regulation of the cell cycle can lead to diseases such as cancer. When the cell cycle proceeds without control, cells can divide without order and accumulate genetic errors that can lead to a cancerous tumor
The cell life cycle is controlled meaning that:
The reproduction of the cell is controlled.
The cell has a "programated death" meaning that at some point, all normal cells die.
If there is a problem with these (uncontrolled reproduction or cells that just not die) a tumor will appear.
Where the tumor is just a mass of these cells that reproduce uncontrolled and that don't die naturally.
So the thing that happens if cell division is not controlled, is that a tumor will appear.
What do you think is the more ethical and feasible approach to wildlife preservation: change human behavior to limit human impact, or create sanctuaries to preserve some of the threatened animals’ population? Why?
Answer:
I think we need to do both, but I'll let you decide which you think sounds better for you personally (personally I think sanctuaries are often more effective).
Explanation:
Behavior changes It is not really ethical to continue to have a negative impact when changing our behavior can help, however, this may not be ideal as explained below
Sanctuaries It is often more feasible to create preservation sanctuaries because 1) it is hard to get everyone to change enough habits in order to create large-scale change and 2) some species require more immediate action to save, whereas changing human behavior may not be enough and/or at the right pace to preserve and expand the populations of endangered populations
Depending on the main threat to a specific population, the approach will obviously be different.
what balances the skills and equipment of the hunter with the abilities of the animal to escape
Fair Chase strikes a balance between the hunter's ability and tools and the animal's capacity for escape. Fair Chase is mainly determined by people and their level of hunting prowess.
What is fair chase?Fair chase is defined as a term used by hunters to refer to a moral method of taking down large game animals. A fair chase is the ethical, sportsmanlike, and legal chase and taking of any free-ranging wild game animal in a way that does not offer the hunter an improper or unfair advantage over the game animals, according to the Boone and Crockett Club.
A wildlife management organization establishes hunting laws in the majority of states. Regular meetings of these organizations will allow members of the public to express their opinions and offer suggestions. When the entire hunting experience is their major focus, seasoned hunters reach the sportsman stage. Although they may still have a target animal or a number of kills in mind, hunters at this stage don't plan their hunts around these objectives.
Thus, fair chase strikes a balance between the hunter's ability and tools and the animal's capacity for escape. Fair Chase is mainly determined by people and their level of hunting prowess.
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Morwenna has always been overweight and Ammon has always been thin. If they both look at pictures of food, a brain scan is likely to show that Morwenna has ________ than Ammon. a. more activity in the limbic system b. more activity in the ventromedial hypothalamus c. less activity in the limbic system d. less activity in the ventromedial hypothalamus
Answer:
???????
Explanation: i can't give you the exact answer but um i think 'cause she's more fatter than Ammon
Plant cells don't have mitochondria in their cytoplasm because of the presence of chloroplasts that convert light energy into chemical energy.
True
False
Answer:
true brainliest pls
Explanation:
plz answer correctly. thank you.
Answer:
Mitosis and cytokinesis
Explanation:
Answer:
see below
Explanation:
1) A- Interphase and mitosis
2) Interphase
● History of Ribosomes./ pls describe and write so facts
Answer:
Ribosomes are small dense and granular ribonucleoprotein (i.e., RNA and protein) particles found attached on the outer surfaces of endoplasmic reticulum and nucleus as well as freely scattered in cytoplasm, mitochondrial matrix and chloroplast.
Explanation:
History of Ribosomes:
Ribosomes were first isolated from E. coli by Tissieres and J. D. Watson (1958), who found that ribosomal RNA alone accounts for 22% of the total weight in rapidly growing cells (90% of total RNA). Palade (1953) was the first to observe the ribosomes as dense particles or granules in electron microscope. Upon isolation they were shown to contain approximately equal amounts of RNA and protein.
Size of Ribosomes:
There are mainly two sizes of ribosomes — (i) One is smaller prokaryotic found in bacteria and blue—green algae, having a sedimentation coefficient 70S equivalent to a molecular weight of 2.7 × 106 daltons. (Dalton is the unit of molecular weight. One Dalton is equal to the weight of one hydrogen atom), (ii) Other is of eukaryotic cells of plants and animals of 80S coefficient with a molecular weight of about 4 × 106 daltons.
Suggest TWO different ways by which the deficiency disease caused by a lack
of iron in the diet could be treated.
Answer: hey i have that problem (anemia) causes passing out and excessive bleeding in the nose.
this could be treated by 1. iron supplements taken by mouth.
2. Foods high in iron and foods that help your body absorb iron (like foods with Vitamin C).
Explanation:
need help on #3: number the following structures in the oder in which blood passes through them - start with the valve through which blood exits from the right atrium.
The order is tricuspid valve, right ventricle, p. valve, p. artery, lungs, left atrium, mitral valve, left ventricle, aortic valve, aorta, tissues and vena cava.
What is blood passage?The blood passage refers to the passage of blood cells in the bloodstream of the circulatory system.
The tricuspid valve acts to avoid the regurgitation of the blood cells in the circulatory system.The pulmonary valve is a channel located between the right ventricle and the pulmonary artery.In conclusion, the order is tricuspid valve, right ventricle, p. valve, p. artery, lungs, left atrium, mitral valve, left ventricle, aortic valve, aorta, tissues and vena cava.
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You are an engineer moving around your community and you find out that they are floods everywhere. What will you advise the community to do to improve the drainage?
Answer:
it depends on the severity of the flooding, if its extreme id say build canals
Explanation:
#1…
#2…
#3…
#4…
#5-…
Answer:
post it again
Explanation:
How many chromosomes does a normal passeriformes have?
Answer:
In general, bird karyotypes have a high diploid number (2n) of typically around 80 chromosomes that are divided into macro- and microchromosomes
Please answer !! 16 points