Which two countries make up about 40 percent of the world’s population?
a. India and Russia
b. Russia and the United States
c. China and the United States
d. China and India
e. China and Russia
ANSWER: d
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In the figure above, which number identifies the tympanic membrane?
a. 4 b. 5 c. 6 d. 8 e. 10
Which of the following is not an important biogeochemical cycle on Earth?
A. phosphorus cycle B. iron cycle C. nitrogen cycle D. water cycle E. carbon cycle
Which of the following is not a characteristic of parenchyma cells?
a. They all lack the ability to photosynthesize. b. They can differentiate into other kinds of cells in response to an injury to the plant. c. They may contain various storage materials, such as starch grains, oils, or water. d. They must be living cells in order to function. e. They may secrete substances of various types.
The tropical rain forest biome is characterized by:
a. high density of plants, but nutrient poor soil. b. high density of plants and nutrient rich soil. c. low density of plants due to nutrient poor soil. d. low density of plants, yet nutrient rich soil. e. intermediate density of plants and intermediate nutrient supply.