How do lodgepole pine trees naturally defend themselves against the beetle?

Answer 1

It used to be the harsh winters with weeks below #0# Fahrenheit, now they no longer have that defence because we have not had a winter with more than #6# days below #0# Fahrenheit at a time in #12# years.

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Answer 2

Luna Cruz

When beetles try to bore into lodgepole pine trees, the resin flow can trap and suffocate them. Additionally, lodgepole pines can increase resin production in response to beetle infestations, strengthening their defense mechanisms. All of these defense mechanisms work together to keep lodgepole pine trees safe from beetle attacks.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.