What is the primary function of the skeletal muscle?
a. heating the body
b. contraction
c. protecting the body from harm
d. pumping blood to the rest of the body

What was the land like over 500 million years ago? what was under the sea?

The pie chart tracks the percentage of renewable energy that's being used in a particular community near the ocean. what are two advantages of using this type of graph for this particular data set?

In what ways does the study of human population differ from the study of wildlife ecology