Answer:
B. Antibodies react specifically with an antigen.
Explanation:
Serological tests are blood tests that look for antibodies in your blood. They can involve a number of laboratory techniques. Flucculation tests are based on the precipitation that takes place when antibody and specially prepared antigens are mixed together
This supports the continental drift idea by example: a fossil animal was in one continent and then you find it in another. This is splitting the continents.
I think the correct answer would be sexuality
The loss in soil fertility, poor crop production, and hardened soil surface I think
