What are the materials called through which waves pass energy?
a. waves
b. amplitudes
c. mediums

Compare the shapes of the bones of the human skull with the shapes of the bones of the human leg. how do the shapes differ? why are the shapes important?

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species

Identify the area on the image where the force of attraction is the strongest.