Chlorophyll, along with sunlight, water, air, and minerals, SWAM, is one of the most essential things needed for life on Earth today. It is the miraculous green pigment in all green plants that allows photosynthesis to happen, which provides most animals with food and oxygen.
Photosynthesis causes green plants to absorb energy from light, originally, and even today, mainly sunlight. Photosynthesis converts light energy into chemical energy that is released to fuel the green plants' various activities, including their growth. That chemical energy is stored in carbohydrate molecules-sugar- which is brought together by combining carbon dioxide from the air and hydrogen from water in the green parts of the plants. Oxygen in the water is released by the plants into air or water as a waste gas.
Almost all animals on Earth use oxygen to burn calories to fuel their activities, including growth. And those same creatures expel carbon dioxide as a waste that is used by green plants for their growth. Most of Earth's critters help manufacture their own food simply by breathing. Animals suck in oxygen and use it to burn calories and live. But those same critters blow out carbon dioxide as a waste product that green plants (producers) take in, (an exchange of gases) along with hydrogen in water, to grow. Later some of the animals (consumers) eat many of those plants and some of those creatures that ingested vegetation will be eaten by meat-eating animals (secondary-consumers).
As one can see, almost all animals on Earth depend on green plants for their food, either directly or indirectly. Without miraculous green plants and the chlorophyll in them, there would be almost no life on Earth, including us people who are consumers and secondary consumers.
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