I believe it’s Precambrian.
Answer:
Cells produce CO2 and use O2 thats why there is less oxygen in exhaled air bc cells used some and more CO2 bc body gets rid off extra CO2 like that
Explanation:
I hope I did't over complicate
I am not entirely sure, but i think it would be the respiratory system because plants produce oxygen after taking in carbon dioxide, and that is similar to the human respiratory system. I am not completely sure though. hope this helps!
Answer:
Avoid moist, shaded, wooded, or brushy areas. When walking in the outdoors, stay on cleared, well-traveled paths, and walk in the center of trails to avoid overgrown grass and brush. Avoid sitting on the ground or on stone walls. Remove leaf litter, brush, and woodpiles from around your home and the edges of your yard.
Explanation:
