Name 4 things attached to the center carbon in all amino acids

This is the diveristy of ecosystems natural communites and habits it is the variety of ways that species interact with each other and their environment

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell

The means by which a cell transports large molecules out of the cell is called