Why does exhaled air contains less oxygen than inhaled air

Pl which diagram illustrates prophase?

What best explains the inability for life to exist in earth early atmosphere

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants. d- food molecules are broken down in the cells if living things.