What roles do Photosynthesis and Cellular respiration play in an ecosystem?

Photosynthesis and cellular respiration allow carbon and oxygen that humans and animals consume cycle through the ecosystem without oxygen and carbon organisms will die

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

In the air and in the lower fre ah water