Different living things adapted (changed) over time to survive. Plants have to complete with each other for resources. Some adapted to grow in deserts so they don’t have to compete with other water-loving plants on more fertile soil. Similarly, many “weeds” are low-maintenance. Unlike more needy plants who need perfect soil conditions, water and sunlight, weeds can survive in unpleasant conditions (low water, bad soil, hot weather, etc.).
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