Help with the questions pls

Which component in a graph indicates an independent factor? a. y-axis b. x-axis c. scale

What molecule contains an organisms genetic material, passed down from parents to their offspring

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods. c. it shows that these organisms share the same habitat. d. it provides evidence that these organisms suffered a genetic mutation.