Which factor contributed least to the extinction of the passenger pigeon species?
A) laws that banned the hunting of passenger pigeons to sell in new markets
B) improved communication technology, which tracked the pigeon flocks
C) expansion of the railroads, which opened up new markets for selling pigeons
D) increased use of the passenger pigeons as a good source for humans

The correct option is A) laws that banned the hunting of passenger pigeons to sell in new markets

Explanation:

All other options describe ways that enabled passenger pigeons' extinction. Laws to ban hunting these pigeons had the opposite effect, that is saving the species from extinction.

Hope that answers the question, have a great day!

Please remember to give Brainliest if you found this helpful :)

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.