Kettle ponds derive from a hole left by a retreating glacier that is subsequently filled with rainwater. A certain region has a series of disconnected kettle ponds, but occasionally heavy rains flood them and create streams. Which type of animal is most likely to be present in this area as a metapopulation?
A. an aquatic bird
B. a dragonfly
C. a mosquito
D. a fish
Answer: D
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Experimenters replaced the statoliths in a crayfish statocyst with iron filings and then held a magnet above the animal. Based on your knowledge of the function of statoliths, what would they observe?
A. The crayfish stayed upright. B. The crayfish lay on its side. C. The crayfish turned upside down. D. The crayfish attempted to escape by rapidly swimming backwards. E. None of these choices are correct.
Since insects do not have blood or a closed circulatory system that needs to be filtered of waste, what do they have instead?
a. water b. hemolymph c. cytoplasm d. They have no body fluid.
The cleavage pattern is influenced by the amount of __________ and its distribution in the egg.
A. albumen B. yolk C. shell D. mRNA
While you are riding the ski lift up to the top of the mountain on a very cold day, you start to shiver involuntarily. You know that the shivering is your body?s attempt to help regulate your body temperature and is an example of what type of mechanism?
A. energy utilization B. evolutionary adaptation C. sensitivity D. homeostasis