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11. Chemical evolution started on Earth ____.
a. after the appearance of prokaryotic cells
b. long before any cells emerged
c. after the appearance of eukaryotic cells
d. after the appearance of eukaryotic cells but before the appearance of multicellular organisms
e. after the appearance of multicellular organisms
ANSWER: b
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a. respiration c. reproduction b. filter-feeding d. both respiration and filter-feeding
__________ sense and respond to water
concentration. Fill in the blank(s) with the appropriate word(s).
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