Hello!
The term that describes the amount of water vapor in the air is absolute humidity.
1. CAUG 2. UUAGGC 3. ACAUCG 4. CGAACAU
I think it might be C I am not 100% sure though
Lethal alleles cause the death of an organism prenatal or after the birth. Lethal alleles are usually a consequence of a mutation and they can be recessive, dominant or conditional. Since the lethal dominant alleles are harmful whether they are carried in homozygous (e.g.AA) or heterozygous (e.g.Aa) form, a strong selection against them is present and thus these alleles are much more rare.