What is the branch of science classifies and identifies organisms?

Name 2 things that a plant cell has that an animal cell does not have? Is human saliva an antiseptic? Is avocado leaf a compound or simple? Function of the petal? Is the stomach considered an organ system? Which type of neurons carries impulses sense organs to the spinal cord or brain? What are the sicknesses dirty water causes? What are the basic units of population? What would happen If all the 280 million molecules of hemoglobin contained in RBCs were free in the plasma? What are the three outcomes of meiosis? What do all eukaryotic cells have that have a membrane-covered compartments called? Why Two species cannot occupy the same niche? How many amino acids in collagen? What is the term for a plant that produces a seed with a protective cover? How do blood vessels cool the body? Compare and contrast a biome and a biosphere? Who discovered the evolution of man? What precautions do astronomers take to reduce the risk of near earth objects? What anesthetizes the tongue reducing taste sensations? Height is controlled by?

What is the branch of science classifies and identifies organisms?