Cervical lymphadenitis is usually caused by a viral upper respiratory infection. The key symptom of lymphadenitis is the presence of a painful mass in the cervical area, often accompanied by fever, runny nose, sore throat, and cough.
Question and answer. Which of the following defines evolution? a change in environmental conditions a change in an animal's physical traits a change in a population's gene pool a change in an individual's genetic. makeup. Evolution is a change in a population's gene pool.
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.