In the early days of biology, all organisms were classified as either plants or animals. Single-celled eukaryotic organisms such as algae and Paramecium were assigned to one of the kingdoms according to whether they are photosynthetic or not. Fungi and prokaryotes were grouped with plants, because fungi are sedentary and prokaryotes have cell walls.

xD Easy enough right??

Except I was up to chem is HS and didn't learn any of this stuff!!!

Now I'm in Biology in college and it's super stupid..
HS teachers do not prepare you for anything.. Waste of time!