Which of the statements accurately describes the role of your heart in delivering oxygen to your body cells?
a. the heart pumps oxygen through the alveoli, which deliver it to body cells.
b. the heart pumps oxygen-rich blood to your body cells.
c. the heart takes in oxygen from the environment and delivers it to cells.
d. the heart breaks down carbon dioxide into carbon and oxygen.

Describe the function of the endomembrane system? what organelles are involved?

Isotopes of the same element have differ in their

1. you serve a volleyball with a mass of 2.1 kg. the ball leaves your hand with a speed of 30 m/s. the ball has energy. calculate it. 2. a baby carriage is sitting at the top of a hill that is 21 m high. the carriage with the baby weighs 12 n. the carriage has energy. calculate it. 3. a car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. the car has . calculate it.