Final answer:
Temperature dependent sex determination, a type of environmental sex determination, is most common in reptiles such as certain crocodiles and turtles, with sex influenced by the incubation temperature of the eggs.
Step-by-step explanation:
Temperature dependent sex determination is most widespread in reptiles. This process, called environmental sex determination, or more specifically, temperature-dependent sex determination, is a mechanism where the sex of an individual is determined by the temperature during critical periods of egg development. This is notably seen in some crocodiles, turtles, and tuataras.
For instance, in many turtles, lower incubation temperatures tend to produce males, while higher temperatures tend to produce females. Conversely, in some crocodiles, moderate temperatures can result in male offspring, whereas both warmer and cooler temperatures may lead to female offspring.