Some animal populations are kept in check by 

A. hosts.
B. decomposers.
C. amensalism.
D. predators.


D. predators.

Biology & Microbiology

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A testcross involves crossing with a(n) _________ individual and is used to determine the _________ of the tested parent

A. homozygous dominant; phenotype B. homozygous recessive; phenotype C. homozygous dominant; genotype D. homozygous recessive; genotype E. F2 offspring; parental genotype

Biology & Microbiology

According to research done by Baron and Prado, how do prions move within the CNS?

a. They use receptors on the surfaces of nerve cells. b. They use vesicles found inside the nerve cells. c. They use tunneling nanotubes. d. They pinch off the nerve cell membrane. e. They stick to the outer surfaces of nerve cells.

Biology & Microbiology

The (body louse/cat flea/dog tick) is the primary vector of epidemic typhus

What will be an ideal response?

Biology & Microbiology

What supplies the energy for muscle contraction?

A. actin B. Ca2+ C. myosin D. ATP E. tropomyosin

Biology & Microbiology