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1. 
Group of cells joined together that carry out the same functions.
2. 
Cells which have no separate nucleus.
3. 
Cells that have a nucleus which contains genetic material.
4. 
Organism which a parasite lives off.
5. 
Reproductive cells used by fungi and certain plants.
6. 
Process that lets plants produce their own food using energy from the Sun.
7. 
Flowering plants that produce seeds in cones.
8. 
Animals that do not have an internal skeleton.
9. 
Gas absorbed by plants in photosynthesis.
10. 
Author of the book On the Origin of Species.