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5:41
YouTube
Cognito
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⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. DNA and Chromosomes * Definition and double helix structure of DNA (Deoxyribonucleic Acid). * How long strands of DNA are coiled up to form structures called chromosomes. * The number of chromosomes in human body cells (46 chromosomes, arranged in 23 pairs ...
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