Answer:
Itemized and explained below.
Step-by-step explanation:
The 3 factors are Analogous organs, homologous organs and Fossils.
1) Analogous organs: This means that organisms that possess similar looking organs could also have different origins.
2) Homologous organs : This means that organisms that possess different looking organs could have very similar origin.
3) Fossils: These are the remnants of dead plants and animals and they help us to make estimates of the age of their evolutionary relationships.