Certain parasites, such as intestinal tapeworms, cannot survive outside of their host. Why are they still considered alive?
A. Survival outside of a host is not a requirement for life.
B. As long as parasites are made of cells, they are considered to be alive.
C. Parasites are still considered alive because they are studied by biologists, and biology is the study of life.
D. Because they cannot survive outside of the host, parasites are actually not considered alive.
Answer: A
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