What are three vital organs of the circulatory system

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

Which organ controls breathing? lungs alveoli heart diaphragm