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1. The algae in the pond is a natural source of nutrients for the fish.
池塘中的藻类是鱼类天然的食物来源。
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2. The bacteria that live in the soil are essential for maintaining the health of plants and animals.
土壤中生活的细菌对于维持植物和动物的健康至关重要。
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3. The study of these organisms has led to new discoveries about the relationship between living things and their environment.
对这些生物的研究已经揭示了生命体与其环境之间关系的新发现。