In some cases the epiphyseal plate of the long bones of children closes too early, resulting in a shorter person. What might be the cause?

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DNA and RNA are similar in that they have: 

An atom has 17 protons and 18 electrons.  It has a charge of:

Acetylsalicylic acid produced from willow bark is identical to acetylsalicylic acid produced from non-living sources.  This is evidence for: 

Taxol produced from Pacific yew trees is identical to taxol produced synthetically from non-living sources.  This is evidence for: 

The molecule in the picture above is a(n):

“A substance that cannot be broken down by chemical means” defines a(n):

A protein is heated, deforming it.  When cooled, the protein returns to its’ original shape in the process of: