A, c, and d are the answers
It’s not b because trees release oxygen and absorb carbon dioxide
the tiny blood vessels surrounding the alveoli are called capillaries.
the capillaries have thin walls and are connected to the larger blood vessels ( veins) and they bring oxygen to the heart threw oxygenated blood.
Answer:
mechanical weathering:
ice wedging: does not change rocks composition: abrasion
chemical weathering:
oxidation: changes rocks composition: acid rain
Because of the relative longevity and reproductive capacity of predators vs.<span>plankton</span>
