C) To gather info about the natural world, to explain natural phenomena, and allow reasonable predictions of future events
Humans evolved 3 billion years ago after the earth was formed.<span />
A. The onset of the menstrual flow
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The answer is <span>Cyanobacteria are photoautotrophs.
</span><span>Cyanobacteria /saɪˌænoʊbækˈtɪəriə/, also known as Cyanophyta, is a phylum of bacteria that obtain their energy through photosynthesis. The name "cyanobacteria" comes from the color of the bacteria.</span>