when a food chain breaks down, the animals above will not have enough food
top of the food chain
If a component is left out of the food chain then something will not be able to eat it. Then it will die, and the component above it in the food chain will not be able to eat it, and will die. Basically, if a component is left out of the food chain, the food chain collapses.
They die
it because
in a food chain and a food web what shows the movement of energy
they get eaten by bigger animals.
I think what you are referring to is a food chain, It is a series of energy steps from plants to animals and more animals in the form of food.
Almost nothing if you are hungry.
Everything in the food chain above them is poisoned as well. The effect is cummulative so the apexial preditors are the most effected.
they die
ALL OTHER ORGANISM BECOME THREATENED