The answer is an envelope.
A virus is an infectious agent that can replicate only inside a host cell. When it is outside the cell, it consists of genetic material coated with protein capsid. Some viruses also have an envelope which covers capsid. The function of the envelope is to identify and bind some receptor sites on the host membranes. After fusing with the cell membrane, it allows to capsid and genetic material to enter the cell and infect it.
(C) earth's outer iron core
this is because iron is magnetic and therefore forms a strong magnetic field
August 4th, 1961.........................................
Answer:
A
Explanation:
because dinosaurs roamed the earth way longer than that.
sorry if im wrong buddy
