Which is a binary star? a) algol b) the sun c) alpha centauri d) polaris e) the big dipper

Alpha Centauri

Explanation:

A binary star is a system of two stars, one revolving around the other or both revolving around a common center. It should not be confused with the two stars that appears close in the sky with the naked eye. Binary stars are classified as eclipsing binaries, visual binaries, astrometric binaries and spectroscopic binaries.

answer by yourhope:

answer is

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

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the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands