evolution. Observation may come after but based on those fundamental elements.
Fossils analysis
Fossils are the rest of living and non living things that existed long ago. Within them we take the rest living and test them in laboratory, not labs, observation also can be done. After testing, we compare depending on what we want to know. In laboratory we can test DNA, number of chromosomes etc. in recent years, this has been done. Fossils have contributed much in evolution reality, and now are still at the top of evolution evidences.
Biological evidences analysis
Anatomical and physiological structures of human determine its relation to other livings. We do not need to discuss much as you know animals that have structures that are like of a human and can be proved genetically. Some genetic characters of some animals approach those of a human being.
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