In the Northern Hemisphere, seasonal variation in temperatures is caused mainly by ____
a. the Earth's elliptical orbit taking it closer to and farther away from the sun
b. the Earth's tilt on its axis of 23.5?
c. seasonal variation of output of energy from the sun
d. warm equatorial air masses rising and spreading north and south
e. uneven warming of the ocean's surface water
B
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Salmon move between freshwater and marine environments during their lifecycle. Which of the following statements about their lifecycle is correct?
A. None of the answer options is correct. B. Juvenile salmon and spawning adult salmon must avoid excessive loss of water. C. Feeding adult salmon must avoid excessive gain of water. D. Feeding adult salmon and juvenile salmon must avoid excessive loss of electrolytes. E. Spawning adult salmon must avoid excessive gain of electrolytes.
Each organism tolerates a limited range of environmental conditions
a. true b. false
Which of the following extremophiles might researchers most likely use as a model for the earliest organisms on Earth?
A) a bacterium found on another planet or moon B) an archaean capable of surviving in the polar ice caps C) an anaerobic archaean species D) a bacterium that thrives in a highly acidic environment
Explain the protective functions of the vertebrate circulatory system.
What will be an ideal response?