All energy in any ecosystem starts as

I'd say heat, more specifically sunlight.

Why?

Because sun is the form of energy needed for plants to grow and live. Plants in turn are the form of energy needed for herbivores to live that later on turn out to be the form of energy needed by the carnivores. When these die, decomposers  will be the ones to take advantage of the energy.

As you can see an ecosystem has already been formed: producers, secondary consumers, tertiary consumers or decomposers.

Hope it helped,

Happy homework/ study/ exam!

What is the difference between cytokinesis in plant and animal cells? animal cells dived by a cleavage furrow. plant cells divide by a cell plate that eventually becomes the cell wall. cytoplasm and cell membranes are necessary for cytokinesis in both plant and animals.