The cyanobacteria changed the composition of the earth’s atmosphere by evolving oxygen in what is referred to as the Great Oxygenation Event. This also allowed the ozone to be formed and block off most of the UV rays that are destructive to genetic material. Life was, therefore, also able to exist on land other than in water.
Answer:
A. is correct
Explanation:
Low-pressure systems are associated with volatile weather conditions like clouds and rain. This is exactly what A says. Hope this helps :)
Answer:
Check for chloroplasts for a plant cell and look for mitochondria's for an animal cell
