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It is an essential part of biology. Also, important scientific facts should not be withheld from children and every approach at denying children to learn about evolution should be seen as child abuse.
Mathematics, physics, chemistry, languages etc. are mandatory too. Why should biology not?
The teacher should first raise claim to how some people see this as a belief, although it is believed to be scientifically fact.
There is no evidence that knowledge of the theory of evolution increases the standard of living in any way.
Who decides what material is "mandatory" and must be taught?
Who prosecutes those who fail to teach the "mandatory" material? What is the punishment?