1. Nucleus
2.Different
3. Size
4. Adapted
5. Body
6. Job
7. Better
Darwin explained that evolution occur due to natural selection.
Humans evolved 3 billion years ago after the earth was formed.<span />
Explanation:
A prominent difference between active and passive immunity is that active immunity is developed due to the production of antibodies in one's own body, while passive immunity is developed by antibodies that are produced outside and then introduced into the body.
