Biology Crossword

4. The development of highly productive crop strains and the use of modern agricultural techniques to increase yields of food crops.
9. The loss of forests.
11. The name of our solar system.
13. The sum total of the variety of organisms in the biosphere.
15. Can not be replenished by natural processes.
17. Gray-brown haze in the atmosphere.
19. Disappearance of a species from all parts of its geographical range.
20. Ms. Wolf's last name.
22. The science of art and farming.
23. The variety of habitats, living communities, and ecological processes in the living world.
24. Finish this phrase: "Red Robin...."
25. Regan's favorite color. (It rhymes with slurple)

1. Species whose population size is rapidly declining and will be extinct if the trend continues.
2. The practice in which large fields are planted with a single variety year after year.
3. The number of different species in the biosphere.
5. The current president of the United States.
6. The sum total of all the different forms of genetic information carried by all organisms living on earth today.
7. Can regenerate of they are alive or be replenished by biochemical cycles if nonliving.
8. The capital of Idaho.
10. The wearing away of surface soil by water and wind.
12. Rain containing nitric and sulfuric acids.
14. Splitting of ecosystems into small fragments.
16. The raising of aquatic animals for human consumption.
18. Harmful material that can enter the biosphere through the land air, or water.
21. Atmospheric layer in which ozone gas is relatively concentrated.