I can imagine that if you ask most people to describe a forest, they will mention trees. Similarly, if you ask, what is a pond, they will maybe say a body of water, maybe with aquatic vegetation around the edge For a grassland they will say grass and a desert maybe sand and cacti. We primarily see what gives these ecosystems their overall appearance or structure. But these ecosystems are so much more. They cannot exist if it was not for the multitude of organisms within them, most of which we may never see or cannot see with the naked eye.
Ecosystems are collections of species where those species largely depend on each other in order to co-exist. Different sets of species create different types of ecosystems, which require energy from the sun to exist. In a forest, the trees, shrubs and other plants