Aneuron's ability to generate action potentials depends: question 1 choices choice a., on the axon reaching threshold and the opening of voltage-gated sodium channels, allowing sodium to enter the axon. choice b., on the axon reaching threshold and the opening of voltage-gated sodium channels, allowing sodium to leave the axon. choice c., on the immediate opening of voltage-gated potassium channels once threshold has been reached, allowing potassium to leave the axon. choice d., on the immediate opening of voltage-gated potassium channels once threshold has been reached, allowing potassium to enter the axon.

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.

the answers are a and c