Register
Free oxygen formed on earth after (1) photosynthesis occurred (2) much of the iron in the oceans had oxidized (3) two phase changes of water (4) surface temperatures vaporized all the water
18.4k views
1 vote
Free oxygen formed on earth after

(1) photosynthesis occurred

(2) much of the iron in the oceans had oxidized

(3) two phase changes of water

(4) surface temperatures vaporized all the water

User ComputerUser
by
4.4k points

1 Answer

4 votes

Answer: (1) photosynthesis occurred

Step-by-step explanation: The photosynthesis process in cianobacteria changed the composition of earth's atmosphera, rising oxygen levels. This could be possible since photosynthesis used energy from the sun to produce energetic intermediaries to synthesize sugars, and as byproduct due to water photolisis, is oxygen.

User Leon Lucardie
by
5.4k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

5.3m questions

6.9m answers

Other Questions

An example of the interaction of the nervous and endocrine systems can be seen in our response to danger. The _______________ orders the adrenal glands to release the hormones epinephrine and norepinephrine,
When an individual stops breathing, brain cells die very quickly, but the cells in the heart are able to survive for longer. Which conclusion is best supported by these facts?
1. Nutrients move from the digestive system into the blood by traveling through ___________, tiny tubes sticking out of the wall of the small intestine. 2. In the body's excretory system, urea and water
Greg has been given a small sample of metal. His teacher has assigned him to identify what type of metal he was given. Which of the following is a physical property that will help Greg to identify the
When smaller molecules are bonded together to create larger ones, the smaller molecules are called _and the larger molecules that they build are called​
Link Copied!