Which concept is demonstrated by a decrease in dull coloring?
a. speciation
b. biodiversity
c. natural selection
d. variation

Which type of neuroglia is found outside of the brain?

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above