Biology Crossword

2. The regulation and maintenance of a stable internal environment in an organism
5. Wave-like muscle contractions that move food through the digestive system
7. The release of water vapour from the aerial parts of a plants
8. The light-sensitive layer at the back of the eye
12. proteins that speed up chemical reactions
13. The process by which cells engulf and ingest particles

1. Chemical messengers that regulate various physiological processes
3. The removal of metabolic waste products from the body
4. The natural environment where an organism lives
6. A process by which large molecules are broken down into smaller ones with the addition of water
9. The unit of heredity that carries information for a particular trait
10. The movement of water across a selectively permeable membrane
11. The process of cell division resulting in two identical daughter cells