Answer:
I think its genetic factors that influence the growth
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"Intruding" or "interfering" could work instead of "snooping" in this excerpt.
It may be a Hyperbole or Satire. Since sawing someone's leg off is likely to be exaggerated, it may be a Hyperbole.
At the same time, depending on the context of this sentence, it may be said for the purpose of humour, so Satire.
Hyperbole seems more probable in my view. :)
