It is better for a predator in a food web, to have …………………………..

when the number of the top predators decrease, the number of preys …….

Overfishing is one of the climate changes that affects the marine ecosystem

Microorganisms are producers that small fish feed on to get energy

If there is a heavy rain in a desert ecosystem, it will be harmed      

Top predators are decomposers that present at the top of food chains

All the following are human activities that affect a marine ecosystem, except ………………………………..

If the amount of grasses increases in an ecosystem, this directly increase- the number of …………………………

In a food chain. the energy transfer …………………………..