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.
Answer:
child birth creates all movement of the body generates heat provides a frame stores minerals and protects abdominal organs
Explanation:
That should be correct
Answer:
Hormones are chemical messengers that use your bloodstream to travel throughout your body to your tissues and organs.
Explanation: