A tracheotomy is performed if enough air is not getting to the lungs, if the person cannot breathe without help, or is having problems with mucus and other secretions getting into the windpipe because of difficulty swallowing. There are many reasons why air cannot get to the lungs.
Trending Now. Answers. Best Answer: Yes, the smallest unit of evolution is the population. The reason is, the techical definition of evolution is change in allele frequency. You have to have a population in order to run the statistics to measure if there has been a change. Remember, a population does not necessarily mean all animals of one species.
Evolution means the changes that occur in a population over time. In this definition, a âpopulationâ means a group of the same species that share a specific location and habitat. Evolutionary changes always occur on the genetic level.In other words, evolution is a process that results in changes that are passed on or inherited from generation to generation.omo erectus was a very successful species of the middle period; fossils have been found throughout Africa, Europe, and much of Asia, and the species may have survived for more than 1.5 million years. The final transition, from the middle to late periods, happened about 200,000 years ago.