I think it should be D. A loss in biodiversity due to catastrophic event.
Answer:
The soil could kill the plants in the area and the consumers will lose there food and the organisms will die off or go extinct.
Explanation:
C. is essential in the synthesis of dna and in the development of red blood cells.
Answer: 1. CCGTAAGCGCTAGTAC
2.GCAATCGTACGAAGTA
3. TGATTGCCATCGATCG
Explanation: you just flip the letters with their corresponding ones