That's the whole point of the etymological approach for scientific terms, especially biological ones: it reduces the number of separate new things to learn. One ancient root getting applied in multiple modern English words including scientific terms means you only need to know that root in order to see its role in all of the modern words/terms it's used in. Then when you encounter a "new" term made from familiar parts, you don't really need to learn that term as a separate new thing. What you already knew before covers it.