Answer:
The pumping of the heart involves the alternate contraction and relaxation of the chambers of the heart. The upper chambers of the heart are called at atria and the lower chambers of the heart are called ventricles.
Answer:
24
Explanation:
24 mating pairs are illustrated in Model 1 .
Answer: Slips, trips and falls are the potential hazards in school
Explanation:Clean and safe water must be provided at schools.
Why do cells have a plasma membrane
Answer:
The electron transport chain is the first step in cellular respiration. The reactions that generate the largest amounts of ATP during cellular respiration take place in the mitochondria.
Explanation:
