What mechanisms do ectothermic animals have for thermoregulation? Check all that apply.
_____ countercurrent heat exchange
_____ changing the rate of heat production by muscular activity
_____ changing the rate of heat loss by vasodilation and vasoconstriction
_____ relocating to warm areas when too cold, or to cooler areas when too hot
_____ insulation in the form of feathers or fur
__X__ countercurrent heat exchange
__X__ changing the rate of heat production by muscular activity
__X__ changing the rate of heat loss by vasodilation and vasoconstriction
__X__ relocating to warm areas when too cold, or to cooler areas when too hot
_____ insulation in the form of feathers or fur
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A control group is _____
a. a set of individuals that have a certain characteristic or receive a certain treatment b. the standard against which an experimental group is compared c. the experiment that gives conclusive results
The explanation for the differences between a human
liver cell and a cell from the skin is the a. maternal and paternal origins of the genes. b. gene content of the two cells. c. expression of the genes in the two cells. d. fact that they originated from different primary tissue layers. e. different functions of the cells.
The free-swimming adult stage of many cnidarians that reproduces sexually is a
A. larva. B. polyp. C. medusa. D. zygote.
The semiliquid matrix of the nucleus is called the (cytoplasm/nucleoid/nucleoplasm)
What will be an ideal response?