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Which group of prokaryotes was responsible for converting Earth's early atmosphere from anaerobic to aerobic?
Sperm
Male reproductive cells that carry a man's DNA and are necessary for the fertilization of a female's egg.
Ova
The female reproductive cells, or eggs, that when fertilized by male sperm can develop into an embryo.
Sebaceous Glands
Small oil-producing glands located in the skin of mammals that secrete sebum, which lubricates and waterproofs the skin and hair.
Organism
A living entity consisting of one or more cells, capable of growth, reproduction, and responding to external stimuli.
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