Which of the following is an example of natural selection? during an especially cold winter, brown squirrels that had thick coats survived at higher rates than brown squirrels whose coats were not as thick. a black squirrel travels from its population to an entirely new population of brown squirrels. most of the brown squirrels that had thick coats were killed during a forest fire. brown and black squirrels mated and produced offspring that were brownish-black.

The correct anser is option (A) During an especially cold winter, brown squirrels that had thick coats survived at higher rates than brown squirrels whose coats were not as thick.

Natural selection is a mechanism of evolution proposed by Charles Darwin. It is the differential survival and reproduction of individual due to the difference in the phenotype. Over time, this process results in populations which are better adapted to their environment as they tend to survive and produce new offspring.  The brown squirrels with thick coat survive at a higher rate than the brown sqirrels without the thick coat. Thick coat is a adaptation for survival in cold winters which are chosen over the other and allowed to reproduce.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

golgi body just took the test on edge