Cell

The cell is define as "The cell is a basic structure & function of all living organism "
The first scientist who discovered a cell "robert hooke " in 1665 .He says that the cell mean "little room"
NCBIScience :
Cells are the structural and functional units of all living organisms. Some organisms, such as bacteria, are unicellular, consisting of a single cell. Other organisms, such as humans, are multicellular, or have many cells—an estimated 100,000,000,000,000 cells! Each cell is an amazing world unto itself: it can take in nutrients, convert these nutrients into energy, carry out specialized functions, and reproduce as necessary.

Biology

Biology is a Greek word . bio mean "life"& logy mean "study" the simple biology definition is "the study of life is called biology
The biology is many branches but there are three main branches
Zoology:
The branch of biology which deals with the study of animals is called zoology. zoo mean animals & logy mean study
Botany:
The branch of biology which deals with the study of plants is called botany
Microbiology:
The branch of biology which deals with the study of microscopic organisam e.g ameoba ,virus ,bacteria etc is called microbiology