In the animal kingdom, amphibians and reptiles are the most frequently interchanged; Here are the similarities & difference between amphibians and reptiles.
As Eukaryotes, plant and animal cells bear great resemblance. However, as two separate entities, there is a big difference between plant and animal cells.
Learn the difference between prokaryotes and eukaryotes cells which is considered to be one of the most important variations among groups of organisms.
Here are the differences between anatomy and physiology from technical & academic perspectives though they make a good pair of related branch of knowledge.