Describe the three main concepts that make up cell theory

Explanation:

1.All living organisms are composed of one or more cells

2. The cell is the basic unit of structure and organisation in organisms

3.Cells arise from pre-existing cells

convalent bond :

is a chemical bond formed by the sharing of electron between 2 atoms.

it is the direct chemical bond between 2 atoms.

in bond formation atoms are involved here.

electrovalent bond:

is a chemical bond defined as electroststic attraction between 2 atoms.

it is the electrostatic attraction between 2 atoms.

in bond formation, ions are involved here.

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