Ascientist observes that a region covered by permafrost a few years ago has now thawed. how could this trend be related to the use of fossil fuels?

greenhouse gases trap more heat in earth's atmosphere.

particulate matter covers and warms the ground.

soil thaws more easily as it becomes more acidic.

factories using fossil fuels generate heat.

Greenhouse gases trap more heat in Earth's atmosphere.

Explanation:

Permafrost is the soil that spends the entire year frozen and that covers 25% of the Northern Hemisphere's land surface, mainly in Russia, Canada and Alaska. It can consist of small fragments of ice or large masses, and its thickness can range from a few meters to hundreds.

The greenhouse gases emitted by large corporations through the constant use of fossil fuels, cause the earth's temperature to rise because they promote heat retention. As a result, permafrost can be defrosted. This is very dangerous for humanity because the thawing of frozen soils and can bring back viruses and bacteria that have been trapped in the past.

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.  

multiplying and dividing the two decimals and the eqations by the same number of the overalls