What do the different scientific theories about how life began on earth have in common? (2 points)
a seed of life was started through meteorite bombardment.
carbon-based molecules formed in an oxygen-poor environment.
early life was aquatic because all of earth was initially covered by ocean.
early earth had to warm considerably after its formation before it could support life.

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation:

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.