D. Zoonosis. It can be transmitted from animals to humans and vice versa.
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The correct answer is B. Honeybee pollinates a flower while gathering nectar.
Mutualism is an interspecific interaction between two species in which both the species are benefited from the interaction. Honeybee visits flower to collect nectar for its food. In the process of collecting nectar, pollen grains stuck to its body. Flower gets pollinated when hone bee visits another flower. Thus, both honeybee and plants get benefit from this interaction.
There are different classes of mutation but the descriptions given here are specifically applied to cystic fibrosis, particularly referring to the CFTR (<span>Cystic fibrosis transmembrane conductance regulator) </span>gene.
<u>Mutation Classes</u>
Class I - Gene contains a stop signal that prevents CFTR from being made.
Class II - CFTR is made, but does not reach the cell membrane
Class III - CFTR is made and in the right place, but does not function normally
Class IV - Channel does not move substances efficiently or at all
Class V - <span>CFTR is made in smaller than normal quantities
(Source: </span>https://www.biologycorner.com/worksheets/case_study_cystic_fibrosis.html)
Given these different classes, the easiest one to correct would most likely be Class V, since in this type of mutation, the only problem or abnormality is the production of insufficient amounts of the needed CFTR.