Photosynthesis is very important to humans and almost every single type of organism on earth. First of all if you think about it, a lot of animals that we eat, eats grass, and other plants. Without plants there wouldn't be enough animals for us to eat. Cows would be gone meaning most of the animals on earth will starve too. Before I get into a lot of details about how important photosynthesis is let me explain what photosynthesis is. I've bet you learned it almost hundreds of time so I'll shorten this explanation. Plants need a source of energy like we humans need food for energy they need the sun. They use the sun, carbon dioxide, and water for energy. They absorb the sun to form hydrogen and oxygen, and as humans breathe in oxygen we pass on carbon dioxide. It's like trading our air for their air. They suck in the carbon dioxide and you guessed it. They breath out oxygen, making it possible for us to breath again.
Now back to the explanation why photosynthesis is a huge part of our lives. Since without photosynthesis we wouldn't even be here on earth, meaning no oxygen. Without oxygen no other animals would live since there would be no plants. Most of them would suffocate in few seconds. I've read somewhere before in the past that if all of the sudden there was no oxygen the whole world would probably suffocate in 3 minutes. Most of the people would not be ready for it, as some coincidentally sucked in air the last second giving them a little more time.
There isn't much to go into detail with since it's really easy to understand once you read it.
Short Answer:
Photosynthesis is important since without it most animals would die in seconds from suffocation without oxygen. Without oxygen means no food too, meaning no animals could eat grass/plants making all of the other organism on the food chain collapsing down into nothing. The whole world's organism would come to an end. Basically meaning everything wouldn't exist if it wasn't for Photosynthesis. Even us.
Hope this answers your question!
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