1.Cell
Cells are the basic unit of life. In the modern world, they are the smallest known world that performs all of life’s functions. All living organisms are either single cells, or are multicellular organisms composed of many cells working together.
2.cytology
cytology is the study of cells. More specifically, cytology is a branch of science
that studies how cells work and grow and what they're made of.
3.protoplasm
the organized colloidal complex of organic and inorganic substances (such as proteins and water) that constitutes the living nucleus, cytoplasm, plastids, and mitochondria of the cell