In 1775 Jenner began to study the relationship between cowpox (a comparatively harmless disease) and the more dangerous and disfiguring smallpox. ... He hypothesized that exposure to cowpox rendered the body immune from smallpox. After nearly twenty years of experiments, he developed the first vaccine.
Answer: There might be more of one kind of flatworm than any other because they adapt more to their enviorment than any worm. OR its because they have more access to resources
on: (any answer is correct because you are making a inference)
Answer:
flora and fauna and also some types of invasive species
Answer:
14. Carcinogenic
15. Not sure. I believe it is monoclonal antibodies.
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