Animals that hibernate during a cold season are seasonal ____
a. endotherms
b. ectotherms
c. heterotherms
d. regulators
e. metabolic activators
c
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Barnacles on the bellies of whales or on the shells of mollusks are examples of:
A. mutualism B. predation C. commensalism D. amensalism E. parasitism
What characteristics of sponges allow sexual reproduction by fragmentation?
What will be an ideal response?
Molecular evidence points to __________ as an
explanation for the great diversity of hormones and hormone receptors in vertebrates. a. polyploidy and nondisjunction b. gene duplications followed by mutations c. continental drift d. chromosomal translocations e. homeotic genes
Which one of the following is true for immune complex hypersensitivity?
A. Complement is involved as a mediator B. There is usually a skin reaction C. The origin of hypersensitivity is the T lymphocytes D. It is manifested within days to weeks E. Dendritic cells are involved