Which principle of heat exchange is the most important explanation for why birds look larger in colder weather because they fluff their feathers?
A) Fluffing feathers results in less cooling by radiation because feathers emit less infrared radiation than other tissues do.
B) Fluffing decreases the amount of heat lost by conduction when the bird makes contact with cold objects in its environment.
C) Fluffing creates a pocket of air near the bird that acts as insulation.
D) Fluffing decreases the surface-area-to-volume ratio, thus decreasing the amount of heat lost to the environment.
C
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This simple plant tissue consists of dead cells
with thick, lignified cell walls that function in support. This plant tissue is
a. parenchyma. b. sclerenchyma. c. collenchyma. d. xylem. e. phloem
Most of the microbes that live in the water and soil are _____, meaning that they live off of decomposing matter
Fill in the blank(s) with the appropriate word(s).
A sampling error could occur from:a
a malfunctioning calculator. b. very few individuals in the control group. c. a poorly designed hypothesis. d. the scientist knowing which individuals were in the experimental group. e. having both an experimental and a control group.
Most of the body's energy reserves are stored as:
(a) fats (b) pepsin (c) glycogen (d) protein