Why is rayon called on artificial silk?

Why is it called so?

Haemodialysis is also called as artificial .........

The hydride of V group element which is used in the manufacture of artificial silk

Which one of the following is called artificial ecosystem

Why is parathormone called hypercalcemic hormone.

Why is mitosis called equational division ?

Write True or False. If false, write the correct statement. Magnets found in the nature are called artificial magnets.

Why neutrons are called neutral particles?