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

The plan which I adopted, and the one by which I was most successful, was that of making friends of all the little white boys whom I met in the street. As many

Look at the diagram below. Which heading best fits in the empty box to the right? Religion Protest Movements Common Law Judges

Famous for his idea on the treatment of mental disorders and the use of psychoanalysis

1. What was a common smell in early Roman mornings in AD 79? a. bacon and eggs b. ash and smoke c. human waste d. cattle moving from the west 2. The streets

When a rock is mechanically weathered, __________________. the surface area of the rock is increased, which allows a greater amount of chemical weathering to oc

John, a graphic designer, is working for a client who is planning to build and sell new homes. John’s client asks him to create a presentation for potential hom

20. What was one place where the Cold War was "hot" and U.S. soldiers fought and died? A. Hungary B. Egypt C. China D. Korea

What is the slope of a line that is parallel to the line with the following equation please help

How were Japan and Germany similar in the 1930s?

In the following scenario, which type of troublesome language is being used? Mom: Aren't you going out with Andrea tonight? Jenna: No, her mom made her stay ho