What group of potential products must be tested in clinical trials before it can be marketed

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

What is the "great pacific garbage patch"? a large area of marine debris concentrated by rotating ocean currents a large area around the pacific rim where debris collects from natural disasters such as tsunamis an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability a large trash dump located in hawaii

How do accessory pigments chlorophyll?