How are valves in the circulatory system similar to sphincters in the digestive system?

a. both limit movement of substances through the system
b. both absorb excess fluid from the system
c. both add strength to the walls of the system
d. both actively push substances through the system
e. both control an exit to the system

answer; /// i believe the correct answer is (reactants);

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.