During which era did life begin transitioning from ocean to land?
paleozoic

mesozoic

neoproterozoic

eoarchaean

Paleozoic

Explanation:

It is during the late Paleozoic era, in the Carboniferous and Permian Periods, approximately 300 million years ago, that this transition occurred. During this period, there were higher global temperatures and tropical swamps dominated land on the Earth. This allowed amphibians to move farther inland.  Later, synapsids and diapsids now dominated the land.

pregnancy happens more and more

b. the carbon cycle ensures living things have a source of hydrogen