Sometimes engineers increase output through crossbreeding. This is when they
A. genetically alter the DNA of a plant to produce a desired trait.
B. cultivate a variety of plants in one area so that cross
contamination does not occur.
C. cultivate a variety of plants in one area so that one pest does not
destroy all the crops.
D. combine two plants so that each plant's strength compensates for
the other's weakness.

am i too late?

explanation:

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

a is the correct answer

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.