Write how embryology is used as evidence for evolution.

Embryology, the study of the development of the anatomy of an organism to its adult form, provides evidence for evolution as embryo formation in widely-divergent groups of organisms tends to be conserved. ... Another form of evidence of evolution is the convergence of form in organisms that share similar environments.

As proper nouns the difference between pangaea and panthalassa. is that pangaea is a supercontinent that included all the landmasses of the earth before the triassic period and that broke up into laurasia and gondwana while panthalassa is (geography) the prehistoric ocean surrounding pangaea.