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Hi Confusions! Hopefully I can help clarify your thinking!
It looks like Mia posed the question "how does the sunlight affect everything" and that's a bit broad but I'll do my best to give you some ideas.
Sunlight is a type of radiation that brings energy (in the form of excited elements/electrons) into our environment. Plants have 'satellites' full of proteins that can receive these electrons and use them to turn protein-based wheels (like steam might turn paddles to power an engine) which harness that energy. So fine-scale in plants that's what sunlight does.
Sunlight, because it's a form of radiation plants are exposed to a lot, can also cause DNA damage. This is the same as why people shouldn't get a lot of sunlight without wearing sunscreen as it can damage your skin (it's really damaging the DNA inside your cells so they can't make proper copies). Plants use the same mechanism to protect themselves, getting a tan! Some plants create pigments (melanin in people, anthocyanin in plants). But plants also have a cool mechanism where, if they're getting too much light and can't handle all the energy, they'll just move their satellites from the cell surface to the sides so they don't pick up as much light!
Hope that helps. If you have any more specific questions about sunlight or need help developing your experimental questions and hypothesis don't hesitate to ask me!
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This post by the mentor explains a pretty broad question "how does the sunlight affect everything?" in a really nice and concise manner.
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