Which best describes what hydrologists study?
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a. earth's atmosphere and weather
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b. the movement and distribution of water and ice on earth
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c. plant and animal life on earth and other planets
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d. rocks on earth and other planets

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?