Is Current Warming Natural? In Earthâs history before the Industrial Revolution, Earthâs climate changed due to natural causes not related to human activity. Most often, global climate has changed because of variations in sunlight. Tiny wobbles in Earthâs orbit altered when and where sunlight falls on Earthâs surface.
Eel prey on fish and small crustaceans. Some eel have mouths consisting of a sucker surrounded with small teeth. The teeth pierce the scales and skin of fish and the eel sucks the blood for nourishment. Other species of eel have many sharp teeth and are able to bite and tear their prey into pieces to eat.
1 At one time, algae were thought to be plants, but are not because they lack roots, stems and leaves. 2  They live all over the world, from the oceans to the desert, and from hot springs to snow and ice. 3  Many things eat algae, including: fish, sea urchins, worms, snails, sea turtles, seals, crustaceans, and even humans.