35. All organisms must be able to exchange chemical substances between their cells and
their environment. Some organisms are unicellular and others are multicellular. These
organisms have different strategies to obtain and use these chemical substances.
• What chemical substances must be exchanged between each organism and its environment?
• Describe the processes that cause these chemical substances to move into and out of cells.
• Describe the role of the cell membrane in the exchange of materials in both types of organisms.
- Describe the role of body systems in the exchange of materials in a multicellular organism.