Answers 1.only type ab
2.types A, B,AB, and O
3.only types A and B
4.only types A, B and O

Ignoring the I's which make no sense. your answer should be C

Explanation:

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

c. heat from the poles back down towards the equator.