Astructure in the leg of a human is found to carry oxygen-rich red blood cells. what else is most likely true about this structure?

a. it carries blood away from the heart.
b. it contains alveoli.
c. it also carries carbon-dioxide-rich blood.
d. it is part of the respiratory system.

Which of the following is the best definition of aerobic respiration? o a. the cellular process that releases energy by breaking down glucose o b. physical activity that involves the repeated motion of large muscle groups o c. physical activity that increases heart rate and breathing rate o d. the cellular process that converts solar energy to chemical energy

Hybrid instruments that play sounds that are part sampled and part synthesized are known as:

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis