The main function of the respiratory system is to <span>manage the intake of oxygen and the output of carbon dioxide.</span>
I would say B. 60 minutes at least 5 days a week. Three or more should have some vigorous activity.
Answer:
D
Explanation:
I think this is the right answer.
Answer:
Organisms tend to be larger in size at higher trophic levels, but their smaller numbers result in less biomass. Biomass is the total mass of organisms at a trophic level. The decrease in biomass from lower to higher levels is also represented by Figure above.
Explanation:
