How does continental drift and the theory of plate tectonics relate to pangea

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.