marla is building a model to show the location of all water on earth. which two spheres contain most of earths water

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

Ais a group of individuals of the same that exist together in the same place at the same time

Me with these questions image attached