Answer: Positive externality
Explanation: Positive externality is the concept in which the service produced and the consumption of that service will provide benefit a third party who is not a part of the process.
While producing fertilizer , it is providing a unintentional benefit to the community surrounding(third party) by keeping the insects away through exerting gases so that they don't cause insect bites or other problem.
Other options are incorrect because negative externalities are negative consequences face by the third party in a process. Comparative externality is related with comparison and pecuniary externality is increment or decrement in market price of service by action of economic actor .
Opinion A, a simple majority (50%+1) of both chambers
<span>I believe that the groups that are most likely to exhibit the most favorable patterns of achievement would be the groups that have the closer family ties, or the groups that had the smaller classes where one on one contact could be initiated.</span>
Then he would know when they were under attack and he could let everybody know.