Where does the energy used by cells come from?" A: The breakdown of food and carbon dioxide
B: The production of proteins
C: The nucleus of the cell
D: The breakdown of food and oxygen
WILL GIVE BRAINLIYESS

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism. humans have eleven different organ systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive. discuss the function of neurons, the brain and the spinal cord within the human nervous system while explaining the interrelationship of each organ.

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine

What are the characteristics of subsystem