If you are looking for solid evidence that current living things originated by common descent and speciation through evolution by natural selection, that evidence is abundant.[1] Some of the evidence backing up what is called "evolutionary psychology"[2] is much more debated, and much more problematic, and other psychologists are quick to criticize many evolutionary psychology publications.[3]
[1] http://www.talkorigins.org/faqs/comdesc/
[2] http://www.cep.ucsb.edu/primer.html
[3] http://www.larspenke.eu/en/publications.html