The correct answer to the question that you asked is D
Answer:
J the appearance of photosynthetic organisms
DNA (deoxyribonucleic acid)
I can't see the well but chemical changes happen when a substance combines with another to form a new substance. These processes are called chemical reactions and are not reversible except if you do more chemical reactions... So the well that is changing it's state of matter should be the one undergoing a chemical change. For, example boiling or freezing
The theory is the Continental drift, the super-continent is called the Pangaea.
