Answer:
A
Explanation:
A(adenine) form 2 hydrogen bond with T(thymine)
G(guanine) form 3 hydrogen bond with C(cytosine)
I'd say
B. Contour Farming
since it's planting on a flat surface and creating w/ridges to help prevent water from taking the crops away
Answer:
Nitrogen
Explanation:
It can change in the Atmosphere or on land:)!
The answer is true letter a