A researcher adds an enzyme to a sample of human DNA to see if the DNA changes. Which result would best support the conclusion that the
enzyme had no effect on the DNA?
.
A. The DNA has uracil bases.
B. The DNA has unpaired nitrogenous bases.
C. The DNA has a single strand with nucleotides and a sugar-phosphate backbone.
D. The DNA has a double helix shape with nucleotide pairs and sugar-phosphate
backbones.

your answer is "the 1950's"

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.