ANChelp ANChelp

09-04-2017
Geography

contestada

How long has the oxygen concentration of the atmosphere been at its current level?

Respuesta :

16-04-2017

the current oxygen concentration of the atmosphere has been at it's current level for approximately 350 million years

Answer Link

Otras preguntas

Need help plzzzzzzzzzxzzz

What message might Edgar Allan Poe want to convey in “The Fall of the House of Usher?”

which of these is a correct statement about RNA molecules?

When the market rate of interest on bonds is higher than the contract rate, the bonds will sell at?

Read the passage from "Pilgrim At Tinker Hill" As each green wave rose from the churning water, it illuminated within itself the six- or eight- foot- long bodie

When we observe a distant galaxy whose photons have traveled for 10 billion years before reaching earth, we are seeing that galaxy as it was when the universe w

Two liquids that are soluble in each other in any proportion are said to be what?

Imagine this field of flowers. Environmental conditions change. The climate becomes colder and the winds become fierce. Such a climate favors plants that grow

A charge is moving in a magnetic field that points to the left. What direction can the charge move and experience no magnetic force? Check all that apply A. up

prufrock seems to be a man who has