Why are viruses called obligate intracellular parasites?
a. They must use a host cell's ribosomes to synthesize proteins.
b. They must use a host cell's nucleotides for transcription and replication.
c. They must use a host cell's amino acids to synthesize proteins.
d. They must use a host cell's metabolic enzymes and pathways to obtain energy.
e. All of the above.

they servive only in living cells.

Explanation:

the virus are connecting link between living and non-living. they are unable to perform life process outside the living cells. outside the living cells, the viruses behave as simple chemical so they are called as obligate intracellular parasite.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?