False, Abiotic is not a living thing.
Answer:
Climate change can melt ice in cold regions, and because ice is freshwater it can change the salinity of the oceans. Some marine animals may not cope with these conditions and may die as a result. This threatens biodiversity because there would be less species of marine life in our oceans.
A food web is a system of interlocking and interdependent food chains.
The answer is the last option. both a and b are correct