Select the correct answer.
how much solar radiation is reflected back by clouds?
a. 5 percent
b. 10 percent
c. 19 percent
d. 30 percent
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What is called the "building block" of life?

How is mitosis different in plants and animals? a. in animals, the cell membrane pinches together. b. in plants,the dna is one circular chromosomes. c. in plants, there are no sister chromatids. d. in animals, a new cell wall forms.

Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .