View the animation on the right.

1) How old is the Earth? 2,000 years 50,000 years 5 million years 5 billion years

2) The early atmosphere was formed from plants cyanobacteria volcanoes asteroid impacts

3) Which one of the following gases was not emitted into the atmosphere from volcanic eruption? Methane, water, ammonia, hydrogen sulfide, nitrogen gas. ammonia water nitrogen gas hydrogen sulfide

4) What elements form amino acids oxygen, nitrogen, phosphorus hydrogen, nitrogen,oxygen, carbon phosphorus, oxygen, nitrogen, hydrogen, carbon oxygen, hydrogen, carbon hydrogen, oxygen, carbon

5) What elements form carbohydrates? oxygen, nitrogen, phosphorus hydrogen, nitrogen,oxygen, carbon phosphorus, oxygen, nitrogen, hydrogen, carbon oxygen, hydrogen, carbon hydrogen, oxygen, carbon

6) What elements form lipids oxygen, nitrogen, phosphorus hydrogen, nitrogen,oxygen, carbon phosphorus, oxygen, nitrogen, hydrogen, carbon oxygen, hydrogen, carbon hydrogen, oxygen, carbon

7) What elements form nucleotides? oxygen, nitrogen, phosphorus hydrogen, nitrogen,oxygen, carbon phosphorus, oxygen, nitrogen, hydrogen, carbon oxygen, hydrogen, carbon hydrogen, oxygen, carbon

8) What was the first molecule to exhibit the ability to reproduce? DNA RNA Proteins fatty acids

9) Two types of RNA called ribozymes evolved, for translating and transcribing. The transcribing ribozyme makes copies of itself translates information into protein , while the translating ribozyme oxygen, nitrogen, phosphorus hydrogen, nitrogen,oxygen, carbon phosphorus, oxygen, nitrogen, hydrogen, carbon oxygen, hydrogen, carbon hydrogen, oxygen, carbon

10) Proteins are formed from carbohydrates amino acids lipids nucleotides

11) What class of molecule formed protective layers around RNA? phospholipids carbohydrates proteins

12) Cyanobacteria were the first replicating cells on Earth and were responsible for methane production through decay oxygen production through photosynthesis nitrogen production. recycling of nutrients through decay.

http://outreach.mcb.harvard.edu/animations/molecEvo8b.swf