Scientist have tried much of the earths history by studying what

Which organ controls breathing? lungs alveoli heart diaphragm

What is the function of the root cap? a. extra-absorbent cells in the root cap absorb more water and nutrients b. protect the meristematic area of the stem c. contains sensors for sunlight d. increases surface area of the root

What do your cells need to live? a. carbon dioxide b. carbon c. air d. oxygen