Question

is there a sentence fragment? during the precambrian period, most of earths life forms lived in oceans. meanwhile, land masses were mostly devoid of life. yes no submit

Explanation:

A sentence fragment is an incomplete sentence. Here, both "During the Precambrian period, most of Earth's life forms lived in oceans" and "Meanwhile, land masses were mostly devoid of life" are complete sentences with a subject and a predicate, so there's no fragment.

Answer:

no