What does an organism's genotype describe?
the allele combination for a trait
the physical appearance of a trait
the number of alleles on a gene
the number of different traits inherited

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.