Crossword project 20

2. The basic structural and functional unit of all living organisms
5. A variant form of a gene
8. A living Individual
9. The process by which organisms produce offspring
10. The observable characteristics of an organism
11. A group of organs cooperating to perform a major function
13. A multicellular organism that conducts photosynthesis
15. The process of taking in oxygen and releasing carbon dioxide
16. Having the same relative position, structure and evolutionary origin
17. symbiosis that is beneficial to both organisms involved
18. A multicellular organism that obtains nutrients by feeding on other organisms
19. A type of cell division that produces four non-identical daughter cells with half the number of chromosomes

1. A change in the DNA sequence
3. The process of change in the inherited characteristics of biological populations over successive generations
4. A community of living organisms and their abiotic environment
6. A non-cellular, infectious agent
7. A structure made up of different tissues working together
12. A group of similar cells performing a specific function
13. The process by which plants convert light energy into chemical energy
14. Single-celled microorganisms