B. State whether each statement is true or false. 1. All living things have a specialized mechanism to exchange substances with their environment.
2. Osmosis involves the movement of solute molecules.
3. The cell membrane is a selectively permeable membrane.
4. Chemicals in the air diffuse until evenly distributed.
5. A concentration gradient occurs when particles are evenly distributed in a region.
6. Diffusion occurs in the lung at the site of gas exchange in the alveoli.
7. Plants obtain carbon dioxide for photosynthesis through their roots.
8. A small surface area increases the rate of diffusion.
9. The tonicity is the comparative differences between the concentration of two solutions.
10. Red blood cells fight against infections caused by pathogens in the body.