5

Question 1

Some of the earliest evidence of some of the first evidence of life on earth predicted, using only radiometric dating, how many years ago did they originate?

Answer 1

3.95 billion years ago. It was suspicious since other biological processes can mediate chemical signals.

Question 2

Stronger evidence that predicted the year of the first evidence of life came from?

Answer 2

Trace fossils.

Question 3

The viral origin hypotheses that were created to predict the origin of virus in the tree of life? 3•

Answer 3

•cellular origin hypothesis: viruses were cellular genetic elements that “escaped”
•Reduction hypothesis: viruses were con cellular organisms
•Co-evolution hypothesis: viruses evolved at the same time as life first appeared on Earth and have been dependent on cellular life ever since.

Question 4

Are viruses within the tree of life?

Answer 4

no

Question 5

The 6 popular model organisms?

Answer 5

•E. Coli
•A. Thaliana
•Saccharomyces cerevisiae
•Drosophila melanogaster
•Mus musculus
•Caenorhabditis elegans