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descended from a common ancestor
There is lots of evidence for a common ancestor but I suggest you look at wikipedia's evidence for common descent or Talk origins 29 evidence for evolution.
It does hint at common ancestry so it is "evidence" of evolution.
Fossil Records, Comparative Anatomy, & Molecular Evidence
I do not know. I can look at shared biochemical pathways and see direct evidence of common ancestry with other organisms.
descended from a common ancestor
The DNA genetic code provides the best evidence of the common ancestry of life. Science has shown that there are many similarities between DNA sequences.
There is lots of evidence for a common ancestor but I suggest you look at wikipedia's evidence for common descent or Talk origins 29 evidence for evolution.
Homologous structures - the forelimb structures are anatomically similar and were derived from a common ancestor; however, they have evolved completely different uses. This provides evidence for divergent evolution or adaptive radiation.
There is no evidence they had anything in common.
The strong evidence for the common ancestry of all vertebrates is THE SIMILARITY OF THEIR EMBRYOLOGICAL STAGES.
Common DNA
Psychology is backed by evidence. common sense is not backed by evidence and can not be proved to be right or wrong, Psychology must be backed by hard evidence and must have proof and experiments done to prove this .
Scientist find evidence about common ancestors.
It does hint at common ancestry so it is "evidence" of evolution.
A common theory is a theory which has not been proven or a theory without evidence.
The single most compelling line of evidence for common descent in biology is the fact that all life adheres to a pattern of differences and similarities that forms a set of nested hierarchies. The same pattern is found whether one studies life's behaviour, morphology, embryological development or genetics.As for natural selection, the strong physical evidence here is that the process can be directly observed.