Natality is usually
A. Constant in a population
B. Constant for a species
C. Variable, depending on the number of recent deaths
D. Variable, depending on environmental conditions
E. Constant in an ecosystem
Answer: D
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Judge the following sentence according to the criteria given below: Usually a parasite does not rob enough energy to kill the host BECAUSE if the host dies, so does the parasite
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
What percentage of electrical power in the U.S. is generated from nuclear sources?
a. ?less than one percent b. ?five percent c. ?10 percent d. ?15 percent e. ?20 percent
What is the difference between a glacier's zone of accumulation and zone of ablation?
Alpine glaciers eroding parallel valleys may produce thin, sharp ridge forms known as arête
Indicate whether the statement is true or false