Adenine can't go with it because adenine can only go with thymine so it prevents it so it can go the right way
Answer:
The organisms have a common ancestor
Explanation:
Homologues structyres conclude that organisms of different species share structures, making them all have some sort of common ancestor
Answer:
C.
Explanation:
Here is a defintion of the immune system:
The major function of the immune system is to protect the host from environmental agents such as microbes or chemicals, thereby preserving the integrity of the body.
C. matches that definition nicely.
:)