<u>Answer:</u>
Cyanobacteria start producing pure oxygen around 200 million years ago.
<u>Explanation:</u>
Many scientists believed that Earth did not have any oxygen. Cyanobacteria or the blue green algae are the microbes which produced oxygen for the first time with the help of photosynthesis. This was around 4.5 billion years ago: after Hadean eon.
They were very simple, but they produced oxygen in the early earth’s atmosphere. So, they brought evolution on earth. This “blue-green algae” exists in salt water, rocks and soils and play a major role in maintaining the ecosystem.
<span>B.) It is moving away from Earth.</span> When an objects moves far from the viewer, it's light is affected by a change called doppler effect or doppler shift.
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They can both be used to identify organisms. Also, the phenotype of an organism is different depending on the genotype of the organism, making them relate to one another.
Hope this helps. Good luck! :)
The ability to grow on limited resources and adapt to the already available resources, characterize the speciation of a new area such as an island. In the process of adaptive radiation, species diversify from their ancestral characters and adapt themselves to newer environmental conditions.
