There are three modes of reproduction. Mitosis is when the cell is divided into two daughter cells. Small portions of their bodies buds off to form new individuals. Most of the large organisms reproduce by means of special cells produced for the purpose. From molecules to tissues 1.
Molecules are the basic structural units of chemical compounds.
Proteins Nucleic acid Lipids carbohydrates 2. Cell is the fundamental unit of life because it is the simplest unit capable existing independently. Some organisms are single cell. Some have many features that are common but they come in a variety of types which adapt to specific functions. Tissues are formed by organizing a specific type of cells.