nolanbarrows5724 nolanbarrows5724

24-08-2018
Chemistry

contestada

How did oxygen come up to make 21% of the earth's present atmosphere?

Respuesta :

iiamkyia iiamkyia

24-08-2018

tiny organisms known as cyanobacteria, or blue-green algae.

Answer Link

Otras preguntas

Fireflies - Comprehension Questions ReadWorks 7. Read these sentences from the text. A set of eyes seemed to pop out of the pitch black in front of her, and she

what’s the feeling of not wanting to be alone?

Marx believed that communism would replace what?

Judy has been having a very difficult time at work. Her supervisor is constantly making her work long hours and is usually very critical of her behavior. This c

what is 77farrenheit coverted into degress

Plant cells communicate throughout the growth and eventual senescence of a plant. Shoot apical meristems are the primary site of _________ production. If the ap

Which energy level requires the most energy to remove an electron?

amanda has certain amount of money if she spends 12$ then she has 1/5 of the original amount left how much money did she have originally.

Which of the following best describes the difference between a nation-state and a city-state? A. A nation-state can be made up of a large area that consists of

How many solutions does a triangle with side lengths a=22, A=117 degrees, and b=25 have?