DNA

Listen : https://youtu.be/8kK2zwjRV0M

DNA Structure and Replication: Crash Course Biology #10 : Hank introduces us to that wondrous molecule deoxyribonucleic acid - also known as DNA - and explains how it replicates itself in our cells.

cell theory

Read : https://www.bioexplorer.net/parts-of-cell-theory.html/