Across
- 5. The immune system's response to infection, injury, or irritation.
Down
- 1. The process by which plants and some other organisms convert light energy into chemical energy to fuel their growth.
- 2. The basic structural and functional unit of all living organisms.
- 3. The ability of an organism to resist and defend against harmful pathogens or foreign substances.
- 4. A protein produced by the immune system in response to the presence of foreign substances (antigens) to help neutralize or destroy them.