Emic0helsypr Emic0helsypr

10-03-2017
Chemistry

contestada

Describe the origin of the oxygen in the atmosphere

Respuesta :

017marsmars017 017marsmars017

23-03-2017

Cyanobacteria appeared about 3 billion years ago in the oceans, the first organisms to develop photosynthesis. These bacteria used CO2 and H20 to produce sugar, and as a by product, produced and released oxygen (O2).

Answer Link

Otras preguntas

suppose an nitrogen atom gains two electrons to become an nitrogen ion. what is its electrical charge?

Which of the following helped the United States to become the best-educated nation on earth during the first part of the twentieth century? more students going

"Why do people go on trips?" (3-5 offers in Present simple). Use helps:

7. Which of the following sentences is written correctly? The film, editor by one of the students in the film class, was too long. The film, have edits by one o

Johannes Gutenberg was most commonly associated with the _____. telescope printing press astrolabe Reformation

what is the only part of a sentence that can ever be implied in English? a. subject. b. predicate. c. direct object. d. object of a preposition

Which sentence from the story best hints at the idea that Arachne has too much pride? "These hands are capable of achievements greater than those of the gods th

Which are characteristics of life in Sparta but not Athens? Choose all answers that are correct. A. Slaves called helots tilled fields and did hard labor.

Which document begins with the words “We the people of the United States”? the first article of the Constitution the Declaration of Independence the first amend

ALEXANDRA BUYS SWEATSHIRTS FOR $12 EACH . IN HER STORE SHE SELLS EACH SWEATSHIRTS BY 25% AS PART OF A PROMOTION ALEXANDRA DISCOUNT THE SWEATSHIRT BY 25%.IF A