Which membrane protein is responsible for restoring the original concentration of ions during the action potential?

Choose the words to complete the paragraph below. are ecosystems that are similar, such as the desert. , the number of species within an ecosystem, is a sign of its health. interesting ecosystem facts include: support aquatic life and are located between land and water systems. the tundra is covered by , which is a frozen layer of soil below the surface of the earth. a place where salt water and fresh water meet is called a(n)