. Which statement best describes what Earth’s outer layer is like underneath the surface in the image? a Underneath both the soi
l and the ocean, Earth’s outer layer is made of sand and water. b Underneath both the soil and the ocean, Earth’s outer layer is made of hard, solid rock. c Underneath the soil, Earth’s outer layer is made of hard, solid rock. Underneath the ocean, Earth’s outer layer is made of sand. d Underneath the soil, Earth’s outer layer is made of water.
Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.
