1. which of the following properties is generally the least useful in identifying minerals? a. hardness b. streak c. cleavage d. color

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

9. wind power creates pollution. water air soil noise

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