7.13: Origins of Life on Earth Flashcards
1
Q
How long ago did Earth form?
A
4.6 billion years ago
2
Q
When was the earliest fossil evidence of life on Earth?
A
3.5 billion years ago
3
Q
What is the RNA world hypothesis?
A
It proposed that RNA could have been the earliest genetic molecule
4
Q
How could meteorites have contributed to the development of life on Earth?
A
Organic molecules could have been transported to Earth by a meteorite
5
Q
What is the Oparin-Haldane hypothesis?
A
Life could’ve arisen step by step from non-living matter through gradual chemical evolution
6
Q
What is the Miller-Urey hypothesis?
A
It found that an organic monomer could be spontaneously produces under reducing conditions resembling those of early Earth
