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Key Idea 6 Review Answers Key Idea 6: Plants and animals depend on each other and their physical environment. 1.) In 1 direction 2.) Sun 3.) Photosynthesis 4.) Autotrophs Herbivores Carnivores Decomposers 5.) Atoms & molecules 6.) Energy 7.) Energy pyramid 8.) Chemical elements: carbon, hydrogen, nitrogen, & oxygen 9.) Lost as heat 10.) Carrying capacity 11.) Available energy, water, oxygen, & minerals, & ability of ecosystems to recycle dead organisms 12.) Decomposers 13.) Bacteria & fungi 14.) Physical conditions including: light, temperature, minerals, soil pH 15.) Environments & resources 16.) Producer/consumer, predator/prey, parasite/host 17.) Evolutionary 18.) Diversity of species 19.) Biodiversity 20.) Variety of genetic material 21.) Potential sources of genetic materials 22.) Interrelationships & interdependence 23.) Ecological succession 24.) Long-term gradual changes 25.) Stable ecosystem 26.) Abiotic 27.) Biotic 28.) Autotrophs/ Producers 29.) Energy 30.) Ecosystem