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Human beings are biological animals, and Planet Earth is our habitat. Rather than being separate from nature, we are actually part of nature and dependent on it for our survival<ref name=":7" />. Microorganisms in our gut aid digestion, while others compose part of our skin. Pollinators such as bees and wasps help produce the food we eat, while trees and plants absorb the CO<sub>2</sub> we expel and produce the oxygen that we need to breathe<ref name=":6" />.
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