Cell membrane is the answr
the answer is... hydrocarbons
Diaphragm...is the muscle that helps in respiration.....there are also some other but....you said flat so diaphragm !
Produced during ATP synthase in the mitochondria
There was no life on Earth for the first billion years because the atmosphere was not suitable for life. Earth's first atmosphere had lots of water vapor but had almost no oxygen. Later, frequent volcanic eruptions put several different gases into the air.
