Origin of life Flashcards
1
Q
decay of radioactive isotopes is used to calculate the time since a rock’s formation
A
radiometric dating
2
Q
The earliest evidence of life on Earth comes from fossils discovered in …
A
Western Australia date back to about 5 billion years ago.
3
Q
formed by the growth of layer upon layer of single-celled microbes, such as cyanobacteria.
A
stromatolites
4
Q
suggesting that life probably began a good deal earlier than billion years ago.
A
Bacteria
5
Q
suggested that life on Earth could have arisen step-by-step from non-living matter through a process of “gradual chemical evolution.”
A
Oparin-Haldane hypothesis, 1920’s
