What 3 molecules that aren't dna us learn about evolution?

We know, DNA is the main molecule by which scientists can learn about evolution by comparing the DNA structure between two different organisms. 
But, in addition to DNA (which is most helpful & important) still, there are 3 molecules that can help us, They are:

1) RNA : - It is found in cytoplasm, as DNA transfers it's codes into RNA during Central dogma, it can help us in evolution studies.

2) Proteins: - Another helpful feature, into which RNA transforms in Central Dogma.

3) Pseudogenes: - It is also known as "Non-coding DNA" It is extra DNA in a genome that do not get transcribed into RNA to synthesize proteins. They can also help us in Evolutionary studies.

Hope this helps!

A- a reduction in biodiversity