The environment determines the sexual phenotype of the individuals in some organisms. Therefore, some environmental factors, measurements of moms and dad human anatomy or of egg, chronilogical age of parent and heat are located to look for the intercourse in after situations:
(a) The intercourse of some reptiles may rely on the heat of which the specific develops. As an example, in many turtles, just females are produced at temperature (30-35°C) and just males are manufactured at low heat (23-28°C). The opposite does work in crocodiles, alligators plus some lizards, where men are manufactured at warm and females are manufactured at low heat.
(b) The marine annelid Ophryotrocha differentiates into a sperm producing male as a young animal and then changes into an egg-laying feminine when it ages.