Guard cells
a. surround the stoma.
b. control the flow of gases between the
interior of a leaf and the atmosphere.
c. become turgid when it becomes light if
environmental conditions are not too hot or
too dry.
d. may absorb water from surrounding
epidermal cells.
e. do all of these.
E
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Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the
laboratory with increasing amounts of the chemical for one week and then measure their viability. When researchers designed this experiment, they wrote "chemical X is toxic to fish" in their lab notebook. This statement is a(n) ____.
a. interpretation b. prediction c. hypothesis d. result e. theory
The great adaptive radiation of hominoids in the Miocene is attributable to ____
a. the proliferation of complex forests b. an extended heating and drying trend c. the advent of bipedalism d. the evolution of a large brain e. changes in tooth structure
A kidney machine removes solutes from the blood by means of
a. osmosis. b. diffusion. c. dialysis. d. active transport. e. bulk flow.
Mucin is a major component of saliva, which lubricates the teeth and causes food to stick together during swallowing
Indicate whether the statement is true or false