KendrahX561393 KendrahX561393

03-11-2022
Biology

contestada

About how long ago did oxygen begin to accumulate in earth's atmosphere?A. 2 billion yearsB. 0.2 millionC. 2 millionD. 20 million

Respuesta :

AllyiahA88631 AllyiahA88631

03-11-2022

Oxygen was accumulated in the earth's atmosphere thanks to the origin of photosyntetic organisms about 2.4 billion years ago, which emitted oxygen as a result of the process.

So correct option is A. 2 billion years.

Answer Link

Otras preguntas

How did the New French government deal with crises?

The most effective way to prepare for a major endurance event is to be sure that your training diet consists of _______ percent carbohydrates. A. 70 80 B. 55 6

Since Claire rarely exercises, she should increase the number of calories she eats. true or false

In which of the following sentences do you find a verb phrase? A. The crowd roared as the bull charged. B. June was a collector of memorabilia. C. I believed e

Which concept would states’ rights advocates have supported during the 1860 presidential election?

Which of the following senses is most closely related to balance? A. Hearing B. Smell C. Touch D. Taste

Proteins that speed up the rate of chemical reactions in the cell without requiring high temperatures are antibodies. a. True b. False

Which of these words is not spelled correctly? genealogy coroborate idiosyncrasy spontaneous

What country in Southeast Asia is predominantly Christian?

The sum of 3 decimals is 6 one of the number is less than 1 what could the numbers be