1. Electron emitted from the nucleus of a radioactive isotope?

2. Soil horizon normally found below the A horizon and above the C horizon?

3. Plant species that completes its life in two growing seasons?

4. Quantitative ratio determined between the parts of systems that display branching?

5. A cosmological theory holding that the universe originated approximately 20 billion years ago from the violent explosion of a very small agglomeration of matter of extremely high density and temperature?

6. Collapse of the Universe into its original form before the Big Bang?

7. Abbreviation of biological diversity?

8. Cycling of a single element, compound or chemicals by various abiotic and biotic processes through the various stores found in the biosphere, lithosphere, hydrosphere, and atmosphere?

9. Field of physical geography that studies the spatial pattern of living organisms?

10. Increase in concentration of toxic fat-soluble chemicals in organisms at successively higher trophic levels of a grazing food chain or food web because of the consumption of organisms at lower trophic levels?