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: Mutation, Natural Selection, Genetic Drift and Gene Flow - What is evolution and how does it work. Evolution is the theory of how one form of life changes into another form. Evolution also is the change of a populationâs inherited traits from generation to generation.