Referring to figure 10.3, oxygen would inhibit the co��� fixation reactions in; a) cell i only.; b) cell ii only.; c) neither cell i nor cell ii.; d) both cell i and cell ii.; e) cell i during the night and cell ii during the day.

the fossil record provides evidence of a common ancestor to many species.

1) a

2)c

3)a

4)c

5)b

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