Explanation

Environmental Determination of Sex In Bonellia, a marine worm, the swimming larva has no sex if it settles down alone, it develops into a large (2.5 cm) female. If it lands on or near an existing female, a chemical from female causes the larva to develop into a tiny (1.3 cm) male. In turtles, alligators, a temperature below $28℃$ produces more males, above $33℃$ produces more females and between $28℃ - 33℃$ produces males and females in equal proportion