The muscular system helps with and the skeletal system helps with . Question 1 options:

movement; oxygen exchange

structure; movement

oxygen exchange; structure

movement; structure

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

Which are characteristics of flukes? check all that apply. a they are free living. b they are a type of flatworm. c they reproduce sexually. d they have eyespots. e they are segmented.

What do transitional fossils best support?