Answer:
please tell me your joking
I think that the italicized word is "trained" as it's a participle and there is no other participle or gerund! A participle is a verb form that can be used to modify a noun.
Remember claims should start with “if” and then have “than”.
If books are heavy than you should not be able to pick them up. Considering muscular strength of the human body the heavier something is the less likely they will be able to pick it up. Thicker books are known to be heavier because they use more paper. Over the years it has been scientifically proven that books are getting longer. It is known that young adult books are the heaviest. This means that most books are known to be heavy.
