The virus is: a. Facultative parasite b. Saprophyte c. Obligate intracellular parasite d. Ectoparasite

Answer: Obligate intracellular parasite
Explanation

A virus is an obligate intracellular parasite. 

Obligate intracellular parasite:

This means a virus must live inside a host cell to replicate and survive.

Viruses lack the necessary machinery to produce proteins or generate energy on their own, so they rely on the host cell's resources. 

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