What are the two parts of the theory of evolution

The first is the word “theory”, which means something slightly different in everyday speech than it does in science.

The second contentious word is “evolution”, because some people argue that there is insufficient evidence to support the idea that species change over time. Proponents of the latter view rely on our dual uses of the word theory to confuse the issues.

Source: http://theconversation.com/explainer-theory-of-evolution-2276

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem

i got you i did it ya know what it is just needing to fill this in for a quick task!