Why is photosynthesis important to the survival of all organisms in an ecosystem?Explain in detail.

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!