What is the main difference between primary and secondary
ecological succession?

According to the loco mass the mass of reactants and products

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity

Jellyfish sometimes squeeze in the sides of their bodies. this pushes a stream of water from the back end of their bodies. according to newton’s third law of motion, how will this behavior affect of the jellyfish ?