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)Parasites are still considered alive because they are studied by biologists, and biology is the study of life.
C)As long as parasites are made of cells, they are considered to be alive.
D)Because they cannot survive outside of the host, parasites are actually not considered alive.

Question

Quizplus · Accepted Answer

Survival outside of a host is not a requirement for life. Life is defined by characteristics such as the ability to reproduce, the ability to obtain and use energy, and the ability to respond to stimuli, none of which require survival outside of a host.

Certain Parasites, Such as Intestinal Tapeworms, Cannot Survive Outside of Their