16747400 celle they permit exchange between the external atmosphere and the circulatory system
Genes are the biochemical units making up chromosomes. The human traits are being influence by genes acting together. Inherited genes do contribute to individual differences in temperament which is the answer. It refers to the individual differences in behavior biologically yet independent in regard to learning, attitude and values.
Answer: The excretory system is largely associated with the urinary, or renal, system. This system consists of various organs that produce and then excrete the urine out of the body: the kidneys, ureters, the bladder, and the urethra. They include the kidneys, large intestine, liver, skin, and lungs. The kidneys filter blood and form urine. They are part of the urinary system, which also includes the ureters, bladder, and urethra. Each kidney has more than a million nephrons, which are the structural and functional units of the kidney.
Explanation:
Mitochondria is the site of respiration