6. The table above shows typical sound inten- sity values on a decibel scale. Which of the
following would you expect to be the
approximate sound intensity of a noisy
restaurant?
A. 20 dB
C. 80 dB
B. 40 dB
D. 120 dB

The biosphere of the earth is made up of . a. inorganic b. organic

Which of the following characteristics are true of enzymes? check all that apply. a.)the structure of an enzyme can change if conditions change. b.)a single enzyme can normally catalyze a wide variety of reactions under many conditions. c.)enzymes are found only in nonliving systems. d.)enzymes allow living things to regulate body conditions through feedback mechanisms. e.)enzymes bind to specific substrates in specific ways. f.)enzymes increase the rate of reaction. g.)when shown in energy-reaction diagrams, enzymes represent the higher activation energy.

Which of the following is a property of an acid solution? a. slippery to the touch b. ph less than 7 c. turns red litmus paper blue d. bitter taste