The different species of finches on the Galapagos Islands are believed to have arisen as a result of natural selection acting on populations of finches that had experienced: a. Convergent evolution b. Gene flow c. The bottleneck effect d. Geographic isolation

geographic isolation

Explanation:

Due to the geographic isolation experienced by these population of finches, they therefore developed beaks adapted to the food source available to them dude to natural selection. Thus the successful finches had the useful beach needed for their survival on the various highland and then reproduced among themselves fixing that adaptation thus giving rise to difference populations of finches long on the various islands of the galapagos.

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.