Across
- 3. A term that describes an organism associated with a water environment
- 5. small organisms that can cause infections in larger organisms
- 6. a species that no longer has any known living individuals
- 10. Plants use the sun's energy to convert water and carbon dioxide into sugars
Down
- 1. Trees and shrubs that shed their leaves at the end of the growing season
- 2. dioxide A gas that is expelled from the body by the respiratory system
- 4. not beneficial, unfavorable
- 7. used during respiration, a colorless, odorless reactive gas, circulated through living things
- 8. Microscopic producers in aquatic ecosystems
- 9. something poisonous, or something very harmful or bad