Which body system is the production of egg and sperm cells, protects and nourishes offspring until birth?? plzz help!

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give

How are viruses different from eukaryotic cells?