What are crab and lobster carapaces composed of?

Structures in cells that carry out specific functions.

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?