1. which of the following is true about life in the precambrian? a) throughout the entire precambrian there were only single-celled organisms on earth b) there was no oxygen on earth throughout the entire precambrian. c) there were no mammals on earth.239200d o lo d) all life was marine (i. e., found in the ocean) e) all living organisms on earth at this time had a nucleus.

Among the given options that is given above ''All life was marine (i.e., found in the ocean)'' is true about life in the Precambrian.

Option D

Explanation:

During the Precamnrian time which includes Earth's history from birth up to 590 million years ago. Precambrian time is further sub divided into Hadean time, Archean time and Paleoproterozoic time, neoproterozoic time.

The sea was mother of all lives and still remains still today. The land based animals also carry a miniature ocean which is present in their cells and circulatory system. All lives including humans could be considered bags of sea water.