Please answer my questions​

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants. d- food molecules are broken down in the cells if living things.

Why are current extinctions of concern to enviromentalists?