In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
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Vertebrates have backbones, while invertebrates do not.
Humans, for example, are vertebrates because we have backbones.
A very steeply sloped seafloor
