i think the answer is convergent boundary
Cyclins are proteins, (so they are not carbohydrates - we in any case reject option A) that regulate the cell cycle - that is the division of the cell. The correct answer is c! Specifically, they active cyclin- dependent kinase enzymes.
Examples of cyclins are cyclyn A and Cyclyn D
a forest fire i think is the correct answer
Fat is the body's most concentrated source of energy, providing more than twice as much potential energy as carbohydrate
It would be the speaker of the house of representatives, in this case it would be Paul Ryan