Animals can navigate by using
A. sound.
B. landmarks.
C. sun.
D. All of these answers are true.
D. All of these answers are true.
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The reservoir for O. anthropi is:
a. environment only, not human flora. b. animal oral and respiratory flora. c. environment, cold climates. d. environment and human flora.
Stanley Miller conducted a famous experiment in the 1950s. This experiment
a. tried to determine how evolution occurs. b. mimicked the early Earth's atmosphere as we know it today. c. showed that simple organic molecules came from outer space. d. used sunlight as an energy source. e. showed that some organic molecules could be formed from non-organic starting materials.
Which of the following is NOT a recycled
element of an ecosystem?
a. water b. phosphorous c. oxygen d. energy e. more than one of these
A positively charged sodium ion
a. would get stuck in the hydrophobic core of the membrane. b. freely diffuses directly across the cell membrane. c. would require the use of integral protein channels to pass through a cell membrane.