Who was the first person to observe a living cell in a drop of pondwater

Antonie van Leeuwenhoek

Explanation: Leeuwenhoek saw a single-celled organism in a sample of pond water in 1675. He was also one of the first microscopists and microbiologists, according to Wikipedia.

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humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.