If an organism is made entirely of one cell it is called...

Reproduction that only involves one parent and all offspring are identical; for example, binary fission of bacteria or amoebas.

Reproduction that involves two cells from different parents unite to produce the first cell of a new organism.

Living things are based on a universal genetic

code. What molecule is responsible for that code?

For single-celled organisms, _____ is

mostly an increase in size.

Multicellular organisms go through a

process called __________, where cells

divide and differentiate into different

kinds of cells.

The combination of chemical reactions through

which an organism builds up or breaks down

materials as it carries out its life processes is called ...

A stimulus can be external or internal.

Maintaining a stable internal

environment is called