Cell bio is important so that we can know more about cells and how they function
I don't know witch definition you mean, but here: https://www.google.com/search?q=google+dictionary&rlz=1C1CHBF_enUS871US871&oq=google+dic&aqs=chrome.0.0j69i57j0l6.3972j0j7&sourceid=chrome&ie=UTF-8#dobs=blowout
Aminotes include synapsids and sauropsids as well as their ancestors, back to amphibians.
Direct observation is an observation you make first hand. It is something you see with your own eyes and observe yourself.
Hope this helps!
