What is the importance of cyanobacteria for our atmosphere? What ...

[audie]

What is the importance of cyanobacteria for our atmosphere? What did they produce and how? What happened to the first materials they produced?
 
  What will be an ideal response?

Question 2

Put the steps of formation of the early solar system in order from oldest to youngest. (Note: First refers to the oldest event and Fifth refers to the youngest.)
 
  A) Rapid expansion of compact, dense mass to create matter and space.
  B) Accretion of bodies to create protoplanets.
  C) Formation and rotation of solar nebula.
  D) Contraction of gases and start of nuclear fusion in the first stars.
  E) Accretion of rocky debris creates planetesimals.
 
  1) First
  2) Second
  3) Third
  4) Fourth
  5) Fifth

[janeli1]

Answer to Question 1

Answer: Cyanobacteria were one of the earliest known life forms on Earth and were responsible for producing oxygen in the atmosphere through photosynthesis. The first oxygen products they produced were removed from the atmosphere by bonding with iron in the ocean, creating the banded iron formations. This process ended approximately 2.5 billion years ago with the Great Oxygenation Event.

Answer to Question 2

Answers: 1) A 2) D 3) C 4) E 5) B