This is a picture of a tree. This tree is an example of a eukaryote. A eukaryote is a multi-cellular organism that has a nucleus in it's cell and a membrane surrounding it. The plant cells that make up this tree have mitochondria, a nucleus, endoplasmic reticulum, a vacuole, and many other things in them. Each cell has a cell membrane and cell wall surrounding what's inside it. Almost every organism on this planet is a eukaryote.
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