2-4 Matching
| chemicals from air pollution that combine with precipitation |
| careful use of resources to avoid wasting them |
| powerful chemicals that kill crop-destroying insects |
| process of collecting water and distributing it to crops |
| thick haze of smoke and chemicals |
| variety of plants and animals living on the planet |
| a method of accomplishing something |
| place shared by plants and animals that depend on one another for survival |
| changing what crops farmers plant in a field from year to year |
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