Obsidian is an extrusive rock that is formed when magma from underneath the Earth's crust breaches and becomes lava. Once the lava starts cooling, it solidifies and elements are frozen, giving the rock its glassy appearance.
Answer: Differentiation allowed the brain and kidney cells to become specialized for the structures and functions they possess.
Explanation:
Osmosis is the diffusion of water in high to low concentration. It doesn’t use energy. It helps equal out the solute concentration.
