<span>the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth </span>
Answer:
The humoral immune response involves mainly B cells and takes place in blood and lymph.
Explanation:
Answer:
An asteroid impact.
Explanation:
An asteroid impact is considered to have tossed rubble across the earth, killing off many species of plants and animals, 65 million years ago. Volcanic activity is involved in at least four mass extinctions, whereas an asteroid in just one.
Answer:
preventing viruses from replicating
Explanation:
