Atlantic cod is a benthopelagic fish that is consumed primarily by humans. These are commercially known as codling. From the given choices, legal regulations and increasing reproductive capacity are both beneficial to the population of the cod. The water temperature is also likely to affect the population but not as much as overfishing does. Therefore, the answer is the first choice.
Increasing melanin production.
Good luck! (:
~ Jasmine
I would say energy myself, and this is because energy plays a key role in all of these. With trophic levels energy is being transferred amongst the levels. Food chain's is a map of how the energy is passed along the chain. Food web is a web of how energy is transferred, and this is why I would say energy is a keyword.