In pedigree B, how can unaffected parents have an affected child?

The unaffected mother, who is marrying in, does not carry an allele for the disease; so the affected child inherits an allele only from the affected father. No child could be affected by a single autosomal recessive allele, or X-linked recessive allele, so the trait is dominant

The childs mother could be a carrier without knowing it which would create the couple to have a child thats affected.

Explanation:

answer: mannn ion even know fam

explanation: just try asking yoo teacher yo parents or just simply another sight

sulfur dioxide

explanation: acid rain is caused by a chemical 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 chemicals to form more acidic pollutants, known as acid rain.