How is photosynthesis importent to other living things in the ecosystem?

It starts the energy chain withen the food chain

Photosynthesis is important** because if plants did not go through this process they would not produce oxygen and humans and most other species would die

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.