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

Why did Columbus write "having trouble with the crew"?

Steve lives in a country which claims to have been the first to adopt Christianity as a state religion. In which country does Steve live?

Which of the following is the best statement? A. Descriptions can be either objective or subjective, as long as they are detailed. B. Descriptions should be po

What is the primary purpose of writing a lab report?

How was England's hold on the colonies weakened between 1700 and 1775? What role did colonial assemblies play in this weakening?

Analysis answers the question: ______. How does the writer say what he says? Does the writer get his point across? Was what the writer said worthwhile?

Jonathan’sparents told him that for every 5 hours of homework or reading he completes, hewill be able to play 3 hours of video games. His friend Lucas’s parents

how do you turn 12.576 into expanded form please explain

what is another name for pi in Germany?

The nation-state concept originated in which of the following countries? A. France B. United States C. Japan D. England