Which of the following describes the fundamental difference between prokaryotic and eukaryotic cells?

Prokaryotic cells do not have a true nucleus or membrane-bound organelles.

Explanation: The most fundamental difference between prokaryotic and eukaryotic cells is the presence or absence of a true nucleus and membrane-bound organelles, such as mitochondria and chloroplasts. Eukaryotes have them; prokaryotes do not. In fact, the name prokaryote means "before a nucleus".

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.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.