made of dna this is the basic physical and functional unit of heredity.

A gene is the basic physical and functional unit of heredity.  1. A gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. The terms dominant and recessive describe the inheritance patterns of certain traits.

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human impact on the environment can be seen in the deterioration of the !

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i would think a oil tanker that has leaked in a bay