The island biogeography model predicts a higher value of ?, the equilibrium number of species, for larger islands close to a source pool and a lower value of ? for small islands far from the source pool. Their reasoning for these predictions is that larger islands support larger populations, lowering the risk of extinction, while closer islands have higher immigration rates because the immigrants do not have to travel as far. What other reasons could you give to justify their predictions? Check all that apply.
A. Larger islands tend to have a more varied physical environment, creating more ecological niches.
B. Closer islands are more likely to receive immigrants of species already present on the island, and this continued immigration can rescue species that might have otherwise gone extinct.
C. Larger islands tend to support species that are more adaptable and therefore, less prone to extinction.
D. Closer islands are more likely to have intermediate levels of disturbance, increasing diversity.
E. Larger islands act as larger "targets" for colonization; immigrants are more likely to land on a larger island than a smaller one.
Answer: E
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The structure involved in equalizing the pressure between the ear and the atmosphere is represented by which number?
A) 7 B) 1 C) 8 D) 9 E) 10
Scientists believe that stimulating growth of algae and other organisms can reduce carbon dioxide amounts in the atmosphere. Where is carbon dioxide consumed in a plant cell?
A. Matrix in mitochondria B. Cellulose in cell wall C. Stroma in chloroplasts D. Number of amyloplasts E. Central vacuole
A size-ordered chart, containing images of all the chromatids (chromosomes) of a cell, is
A. a karyotype. B. All of the answer choices are correct. C. used to detect damages to chromatids. D. used to show autosomes and sex chromosomes E. used to detect chromosmal abnormalities such as trisomy.
A recessive allele: Check all that apply.
A. will never have an effect on an organism's phenotype. B. will have no noticeable effects on an organism's phenotype if a dominant allele is present. C. will have an effect on an organism's phenotype if the individual is homozygous for the recessive allele. D. can be on either the maternal or the paternal chromosome.