What is not necessary for an organism to survive? O parents
O water
O energy
O a place to live

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Which statement describes the punctuated equilibrium theory?

When you aware sick your body produces more leukocytes.briefly describe where the leukocyte are formed,how they are transported,and where they may be stored.