What is the primary role of the respiratory system in living organisms? a. to make carbon dioxide b. to obtain oxygen c. to use up nitrogen d. to find hydrogen

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Where can a dna be found in a prokaryotic cell

How long does it take a skateboarder going 6.0 m/s to come to a complete stop if she slows down at a rate of 2.0 m/s^2