7. Choose the answer that best completes the sentence below. one type of tissue in the heart by itself cannot pump blood through the
body, a collection of the four types of tissue in the heart can work together as an organ
to pump blood.
A. Thus
B. Although
C. Above all
D. For instance

Mitochondria is the cell organelle that produced the energy that is needed in the body system in form of atp, that is why it is called the power house of the cell. energy is needed by the living organisms to carry out the activities which sustain life.  if the mitochondria is destroyed atp will not be produced. if the mitochondria is destroyed, energy production will stop and the affected living organism will not have the energy to carry out the necessary life processes; this will lead to the death of the organism.

The higher you go up the less oxygen there is