Acid rain<span> is caused by a </span>chemical<span> reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other </span>chemicals<span> to form more </span>acidic<span> pollutants, known as </span>acid rain<span>.</span>
Androgen hormone is the primary determinant of whether a baby will develop male or female external genitalia.
Androgen is usually a steroid hormone. The predominant and most active androgen in testosterone, which is produced by the male testes. Some androgens are naturally produced in the body and if the body doesn't make them properly they can be obtained through prescription medication.
B-monomer
I am not sure about the second one but i think it's C
