If an enzyme has its optimum activity at neutral pH, to which of the following pH values does this corresponds? *

PH 12

PH 7

рн 3

PH 14

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

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

Fill in the blank with the correct sphere label. a: ⇒ geosphere b: ⇒ biosphere c: ⇒ hydrosphere