Many species appear to be related to a single ancestral species . The percentage of a specific allele of a gene in the gene pool . Unrelated species becoming more and more similar in appearance . One way to determine the age of bones is the radiocarbon dating method. Your opposable thumb makes it possible to communicate.
Speciation is a common occurance in nature.
Evolution is a biological fact. Living things change over a period of time. A population will remain in genetic equilibrium as long as mutations occur. Humans have been on earth for most of earth's history.