Two falling inflated balls of different masses land at the same time

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

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water