In the word ecologists, is eco the root morpheme or ology? Are the morphemes eco, log, y, ist, s or ec, ology, ist, s ?

Question

This is very confusing for me. Any explanation on how to find the root would be appreciated. It's easy to find roots on some words, but words like ecology, financially, and contributions are more difficult. I'm not sure about the morphemes either.

For example, on contributions are the morphemes con, trib, ute, ion, s or con, tribute, ion, s?