Food can come from sustainable or unsustainable resources. why has the united nations suggested that bugs could be a better source of food than animals like pigs or cattle?

The suggestion from the United Nations that the bugs can be a better choice for food source than the pigs and cattle is because of the sustainability of the bugs as a food source.

The bugs consume much less food, and their food choices have a very wide range, often being very opportunistic eaters. Also, they multiply extremely quick, grow very quickly, and are an excellent source of protein. All of that compared to the pigs and the cattle and their demands, time for growing, and space they occupy, gives the bugs a big advantage.

On the other hand, most of the nations are not willing to try such a move. The reasons for that is that most of the people, especially the ones in the developed and developing world find the bugs disgusting, so consuming them is something that they will never do.

the wrong statement is - c. a desert had more biodiversity than a marsh.

the deserts are one of the places of the planet where there's the least biodiversity. the reasons for that are the climate and the lack of food sources, which hampers both the number of the species that can survive in it, and the number of the individuals in the species itself.

the marshes, on the other hand, are places where there's perfect conditions for lots of organisms to thrive. the temperature is moderate and nice, the amount of water and the food sources are on a high level, so there's an abundance of both plant and animal life in them.