chemicals in b&w photo processing

I'm not really into developing photos but since I have photogrammetry & photo interpretation subjects at school, I was required to develop a photo and I really liked it. Unfortunately, the photo developing exercise wasn't much coz the developing, stop bath, & fixing solutions were already mixed by the lab technician and I'm wondering, what are the these basic chemical in photo processing? Thank you for your answers. I would really appreciate it!

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