This <span>statement should be classified as</span> a theory
The nicotine indirectly inhibit the CB1 or also known as the
Cannabinoid receptor type 1, which is the one responsible in obesity and
metabolic syndrome, thus, this would explain the weight gain associated with
people who quit smoke as if this is indirectly inhibited, it produces weight
gain.
The risk of introducing a natural enemy to control an invasive species is that: The natural enemy may introduce genetic diversity into the invasive species. Thus, option "D" is correct.
<h3>What is non-native?</h3>
Non-native species are considered to be invasive only when they cause harm.
Some of the features that increase the possibility of a non-native species becoming an invasive species are they reproduce easily, they are habitat generalists, they out-compete other plant species, possess the tendency to produce abundant seeds, and are not influenced by the native diseases and pests.
Thus, option "D" is correct.
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By separating the DNA from other tissues, then using an enzyme to break the DNA into short lengths.