4. Which describes the hypothesis of how life formed on Earth? Small chemical units joined into larger ones and eventually into cells.
Earthquakes and volcanic eruptions produced the first cells.
Archaea-like organisms spontaneously formed in the oceans.
Once oxygen accumulated in the environment, cells rapidly formed.

What makes water a renewable source

What sequence of events lead to the colonies declaring independence from great britain? i need to write an essay about this ! you can get an easy 25 points if you me!

Dr. laguardia is a cognitive neuroscientist who is interested in the effect of brain concussions on the ability to recognize faces. he conducts a quasi-experimental study in which he examines football players before and after the regular season using the benton facial recognition test (a published, widely used measure of one's ability to recognize faces) to compare those who received concussions to those who did not. he finds that players who had concussions during the regular season performed worse on the benton facial recognition test than did players who did not experience which of the following is true regarding external validity in dr.laguardia's study? a. because dr. laguardia selected participants who actually experienced concussions, the study b. because dr. laguardia's study is a quasi-experiment, it is impossible to obtain c. because dr. laguardia's dependent variable was assessed in the laboratory, the study d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.