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Transubstantation refers to the Catholic belief that during the Sacrament of the Eucharist - Communion - the bread literally transforms into the body of Christ. It is no longer a metaphor for his body ...

A reflex action is an automatic rapid involuntary response, which acts to protect the body from damage. Such as when you touch something extremely hot, you involuntarily remove your hand from the hot o...

An enzyme is known as a biological catalyst. This is because they can speed up reactions by providing an alternative pathway, lowering the activation energy of the reaction. They are normally composed ...

Background knowledge

DNA - carry the genetic code that determines characteristics of an organism

Chromosomes - made...