The nictitating membrane of sharks is used to:
a. protect the gills.
b. line the mouth.
c. enclose the internal organs.
d. detect smells.
e. cover the eye.
E
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To understand past and predict future changes in populations, ecologists use three important factors. These are:
A. the population's birth rate. B. expected longevity of individuals in the population. C. the proportion of individuals in the population able to reproduce. D. the population's birth rate and the expected longevity of individuals in the population. E. the population's birth rate, the expected longevity of individuals in the population, and the proportion of individuals in the population able to reproduce.
The electron transport system
A. requires a membrane. B. utilizes the nuclear membrane of eukaryotes. C. utilizes the mitochondrial membrane of prokaryotes. D. generates a concentration gradient of protons. E. requires a membrane AND generates a concentration gradient of protons.
Animal body plans can evolve, because changes in genes that regulate development will alter body form. However, some factors limit the changes that can occur. Describe these factors
What will be an ideal response?
A farmer has grown strawberries successfully for years in field A. He recently expanded the crop into previously unused land in fields B and C. The yield from field B is comparable to A, but the yield from field C is inexplicably low. As a microbiome expert, what might you predict about the soil of fields A, B, and C?
A. Field C may be lower in AM fungi compared to soil from fields A and B. B. Fields A and B may be free from ectomycorrhizal fungi. C. Field C may have large amounts of microcystin due to algae blooms. D. Fields A and B may have benefited from the absence of nitrogen-fixing bacteria.