If protein is the heritable material, how many unique sequences of 10 amino acids are possible?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Amniocentesis is a process in which amniotic fluid is taken from the mother's womb to identify any genetic abnormalities in the fetus. how would the discovery of the human genome contribute to this process?

How does the nervous system affect the excretory system?