Tectonic plates are able to move because of

a) sliding of the continents toward the oceans

b) gravitational differences between different parts of earth as it revolves around the sun

c) relatively dense oceanic crust sinking into the weak asthenosphere at subduction zones

d) the sinking of the continents into oceanic crust at the mid-ocean ridge

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.