A) A sound wave
The other 3 create mutations, are cells are hit by sound waves all the time and experience no mutations because of it
Agricultural chemicals is an example of a nonpit source of freshwater pollution
Answer:
The basal cell layer is the innermost layer of the epidermis, comprising the keratinocytes and melanocytes. Keratinocytes play an important role in providing skin structure and in functioning of the immune system. Melanin is a pigment produced by melanocytes, and is responsible for providing the skin color.
