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An ecosystem is a place where plants and animals ( maybe humans ) live and animals and plants live in the desert so … 
Humans themselves do not use photosynthesis, but because humans depend on plants, as well as other animals that eat plants, in order to live, no, humans could not live without photosynthesis. Unless plants had another way to make food for themselves, humans could not live without photosynthesis.
NO
Bacteria live in and on animals, humans and plants.
Of course humans, animals and plants.
Plants depend on soil to live and grow, Humans & Animals depend on those plants.
yes. they help humans food grow which helps the humans by not starving them. Without food humans could not live.If your thinking about animals, animals need plants too, so without plants humans could not live.
Water is needed for animals, plants, and humans to live.
yes. no.
yes, animals, humans, and even plants nêd air to live
There are certain chemicals that the animal needs to 'recharge' its system. They also have not yet adapted to not relying on plants, like carnivores. Plants are probably abundant in many areas where animals that eat them live.
Squirrels, bears, deer, birds, hedgehogs, pigs, raccoons, and plants people don't belive it but plants are animals they eat and breath like animals and humans