2.1

The smallest functional and structural unit of all living things

the maintenance of a constant internal state in a changing environment

reproduction in which the sex cells from two parents unite to produce offspring that share traits from both parents.

reproduction that does not involve the union of sex cells and in which one parent produces offspring are genetically identical to the parent 

the sum of all chemical processes that occur in an organism

anything that causes a reaction or change or any part of an organism