There are a large number of microorganisms that can get energy from chemical reactions near deep-sea hydrothermal vents and cold spring vents. Scientists call them chemoautotrophic microorganisms. Some of them like "eating" methane, some like "eating" hydrogen and some like metal ions. Don't underestimate these quirks of benthic microorganisms, they are the secret for microorganisms to fill their stomachs and thrive! The proliferation of chemoautotrophic microorganisms provides sufficient food sources for deep-sea animals, thus forming a unique biological community completely independent of sunlight in the deep sea.

The sun is the most important energy source on the earth. It shines on the earth, making the earth on which we live vibrant and everything prosperous. The direct users of sunlight are green plants that have lived and multiplied on the earth for more than 2 billion years. Some of these green lives are huge, forming lush forests on the earth's surface; Others are very tiny, roaming in the transparent layer of the blue ocean. Their common feature is that they can convert solar energy into chemical energy and produce organic matter through photosynthesis. These green plants can be eaten by animals on the earth and form the basis of the earth's food chain.

In fact, there are two kinds of energy on the earth that can support life activities. One is energy from outside the earth, namely solar energy. They reach the earth in the form of sunlight, and the growth of green plants on the earth depends on this energy. Another kind of energy that supports life activities comes from the interior of the earth. These energies are produced by chemical reactions of substances in the earth and can also be absorbed and utilized by life.