What has been attributed to the declining fertility of seals and sea lions off the California coast?
a. DDT
b. refined oil spills
c. PCBs
d. CFCs
e. mercury
c
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What biome is locally named the Chaco, the Caatinga, the brigalow, and the dornveld
A) Mediterranean shrubland B) Arctic and alpine tundra C) tropical savanna D) tropical rain forest E) tropical seasonal forest and scrub
Judge the following sentence according to the criteria given below: Microscopic zooplankton are primary consumers BECAUSE they are incredibly abundant in the ocean
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.
The doubling time for a population with an annual percentage growth rate of 7.0% is
A. 50 years B. 10 years C. 1 year D. 5 years E. 100 years
Which of the following is the larger scale?
A. 1:1,000,000 B. 1:10,000 C. 1:2,500,000 D. 1:10,00,000