Answer:
Cells provide the necessary structural support for an organism.
P.s you should link or photograph the model
B) The atria only recieve blood and the Ventricles have to pump the blood
All they need for their living is carbondioxide in air ,water and some nutrients .so basically their roots are responsible for collection of water which contains life giving nutrients .but we take food as a solid substance which hasto be converted into energy
Celluar respiration breaks down glucose and photosynthesis makes glucose.
C is the answer.
Explanation: I had this in my test.
