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2. what was anton van leeuwenhoek one of the first to see in the 1600s?

How does photosynthesis show the conservation of mass and energy?

Which could be a pathway of food through an ecosystem

The source of energy shown in the image is (renewable, non renewable, polluting) a drawback of building a dam is that (it will destroy ecosystems, it requires fossil fuels, it won’t be useful for irrigation)