What are vectors in biology

Traditionally in medicine, a vector is an organism that does not cause disease itself but which spreads infection by conveying pathogens from one host to another. Species of mosquito, for example, serve as vectors for the deadly disease Malaria.

Explanation:

A.The population of pink katydids will decrease.

B.The population of green katydids will decrease.

Explanation:

The two statements describe what will eventually happen to the population of the katydids are that:

• A.The population of pink katydids will decrease.

• The population of green katydids will decrease.

This is because from the information given, since birds started feeding on the katydids, this will result in the reduction in the number of katydids. Hence, the decrease in both the pink and the green katydids.