Darwin's theory states, in part, that individuals with certain traits have an increased competitive edge. What is the

source of these traits?
a. adaptation to stress
b. development over a lifetime
c. inheritance
d. mutation after birth
e. better living conditions


ANSWER: c

Biology & Microbiology

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Indicate whether the statement is true or false.

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Oxygen moves from alveoli to the bloodstream ____

a. because the concentration of oxygen is greater in alveoli than in the blood b. mainly due to the activity of carbonic anhydrase in the red blood cells c. against a concentration gradient d. to equal the concentration of CO2 in the blood e. by active transport

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In their relationships with humans, are most species of bacteria beneficial, harmful, or no noticeable purpose?

What will be an ideal response?

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As fatigue increases, the risk of injury ______.

a. stays the same b. becomes unavoidable c. increases d. decreases

Biology & Microbiology