Across
- 3. The level 3 and 2 on the food chain are _________.
- 7. The amount of biomass produced through photosynthesis per unit area and time by plants.
- 8. The total weight of all organisms in a population.
- 9. The science that studies the heredity traits.
Down
- 1. Selective breeding is used in p_____ and a______.
- 2. The variety of living organisms found on earth.
- 4. This method involves choosing desirable characteristics for continuation in next generation of cattle.
- 5. Climate change affects _______.
- 6. The result from selecrive breeding of two different varieties.