The difference between Biological and Biological clock
When used as nouns, biological means a biological product, whereas biological clock means any of several mechanisms that regulate the periodicity of biological functions.
Biological is also adjective with the meaning: of or relating to biology.
check bellow for the other definitions of Biological and Biological clock
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Biological as an adjective:
Of or relating to biology.
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Biological as an adjective:
Related by consanguinity, especially as to parents and children.
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Biological as an adjective (proscribed, used by, _, NNES):
Organic .
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Biological as a noun (rare):
A biological product.
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Biological clock as a noun (biology):
Any of several mechanisms that regulate the periodicity of biological functions.
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Biological clock as a noun:
The progression from puberty to menopause during which a woman can bear children.