Scientists often perform experiments to check and recheck their work. They also redo these experiments to ensure correct results.
A planting trees around a farm
Explanation:
Trees majorly help us out, by converting carbon dioxide into oxygen. If you cut down trees that releases carbon dioxide out into the air.
Option C. the larger A pairs with the smaller T, and the larger G pairs with the smaller C.
The answer's D. Cretaceous.
