Answer:
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10) botanists .
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11) ecologists.
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12) geneticists.
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13) agronomists.
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14) zoologists.
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15) entomologists (not just insects, but "bugs"; and terrestrial arthropologists as well - look up the definition of "insect").
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16) paleontologists.
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17) anthropologists.
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18) marine biologists. (also, look up "limnologists"/ limnology).
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