In a population of beetles, some are green, some are brown, and some are mixed. if the beetles live in vegetation, the colored beetle is "least fit" and least likely to survive in that habitat when birds come along looking for food. a. green b. brown c. mixed

B. Brown

Explanation:

In order to understand the answer of the question we need to understand a mechanism called Camouflage  first.

It refers to a process which some animals insects or other living organisms adapt by changing their body color or color combination in such a way that they are less visible to predators. This is basically a survival mechanism which increases their chances to avoid the predator and live safely.

If we talk about beetles they have three colors, Brown , Green and mixed. If beetles are living in an area where trees are highly polluted due to air pollution and have got brownish in colors, in that area brown beetles have better chances of survival because they will not be very visible to predators due to a similarity of their body color with tree colors.

In question, we are asked about Beetles that live in vegetation and vegetation is obviously greenish in color. So brown beetles are least fit in this area because they will be easily visible to predators on green vegetation that clearly lowers their survival chances.

Hope it help!

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]