<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.
Answer:
Another evidence of evolution is the convergence of form in organisms that share similar environments.
97 percent of the Earth's water can be found in our oceans
Answer:
The Cerebellum
Explanation:
The Cerebellum, or "little brain" controls all aspects of balance, speech, movement, coordination, and motor skills.
