2. What type of waves do not require a medium? Longitudinal waves
Sound waves
Surface waves
Transverse waves

Does masterbation affect height growth or loss of growth hormone?

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

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above