If an animal finds his way by the type of wayfinding known as piloting, then he is using ____
a. familiar landmarks to guide his journey
b. the sun's position in the sky to orient himself
c. both the sun's position and a mental map
d. the Earth's magnetic field to orient himself
e. another animal to lead the way as he learns the route
A
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Acute viral gastroenteritis can be caused by the
A. varicella zoster virus and rubeola virus. B. the Delta agent. C. cytomegalovirus and hepatitis E. D. norovirus and the rotavirus group.
Nitrogenase is a critical enzyme in the nitrogen cycle because it catalyzes the
A) assimilation of ammonia. B) dissimilative reduction of nitrate to nitrogen gas. C) fixation of nitrogen gas into ammonia. D) oxidation of nitrogen gas into nitrate.
The extracellular matrix is composed of: (1) proteins; (2) polysaccahrides; (3) nucleic acids
A. Statement (1) is correct. B. Statement (2) is correct. C. Statement (3) is correct. D. Statement (1) and (2) are correct. E. All the statements are correct.
A necropsy (postmortem analysis) of a marine sea star that died after it was mistakenly placed in fresh water would likely show that it died because _____
A) it was stressed and needed more time to acclimate to the new conditions B) it was so hypertonic to the fresh water that it could not osmoregulate C) its contractile vacuoles ruptured D) its cells dehydrated and lost the ability to metabolize