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.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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