11. Recognize the two major hypotheses about the origin of organelles 12. Recognize the evidence that supports the serial endosymbiotic theory of the origin of chloroplasts and mitochondria. 13. Recognize the contribution of three different types of scientists that contributed to the development of the SET: cytologists, biochemists, and geneticists.​

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.