Environmental Science
The response of predator to prey and vice-versa, over ten of thousands of years, produces physical and behavioral changes in a process called

Evolution
Origin
Co-evolution
Development

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Environmental Science
When clouds are viewed near the horizon, the individual cloud elements usually:

Appear closer together than is actually the case
Appear lighter in color than is actually the case
Appear to have more vertical development than is actually the case
Appear farther apart than is actually the case

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