Answer:
A. They also help the environment by refreshing the air and by reducing smog and effects to the ozone layer.
Explanation:
The author makes a claim that environment is refreshing by the air and the effects on ozone layer are reduced. This statement is not supported by the evidence. The ozone layer is polluted by the environment pollution. The pollution created by humans is also affecting the air which ultimately pollutes the ozone layer.
Answer: virus disease of chickens and other birds characterized by warty excrescences on the comb and wattles, and often by diphtheria like the changes in the mucous membranes of the head.
Explanation::))
