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

_____ software comes with many features and tools, and despite the fact that many of CRM products offer similar feature sets, there are some unique tools in eac

Is [tex] \frac{2}{8} [/tex] = [tex] \frac{3}{9} [/tex] a proportion? Explain

Locate the gerund. Since it is used as a noun, determine its noun use. A popular pastime is backpacking.

Executives with a particular mix of skills and experiences may be classified as an executive type and paired with a specific personal characteristic a specific

In an essay, flow is?

Attitudes, beliefs, values, and motivation are characteristics of: a. psychographics. b. demographics. c. the speaker’s profile. d. the audience’s response

The Ford Pinto case demonstrated that it was cost-effective in the long run to allow purchasers to die. it was cost-effective in the short run to allow purchas

Hydrocarbons are organic compounds which contain: H H and C only H and C C and H2O

When you purchase an item in a store, you may be charged __________.

Is the period of transition between childhood and adulthood.