An agent that exhibits the tendency to modify the genetic material of a species, thereby resulting in mutation is known as a mutagen. Tobacco is a chemical mutagen. Tobacco smoke comprises a mixture of many chemicals that incorporates about 60 carcinogens, that is, the chemicals that can result in cancer.
One of the examples is benzopyrene found in tobacco smoke, which has been found to result in mutations. Therefore, tobacco is regarded as a chemical mutagen.
A keystone species helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether.
Two objects that are similarly charged will repel, while two objects with oppositecharges will attract. Moreover, a neutral object will attract either charges.
Answer: D. Water will move across the cell membrane in both directions because the concentrations of solute particles inside and outside the cell are the same.
