Which of the following can change sex, indicating that sex is not genetically determined?

Correct option is D

·        Snails can change sex, indicating that sex is not genetically determined: 

·        Explanation: Snails are obligate hermaphrodites, meaning they have both male and female reproductive organs. They can produce both sperm and eggs while mating. 

·        Sequential hermaphroditism: Snails are capable of changing their sex at some point in their life, a phenomenon known as sequential hermaphroditism. This allows snails to adapt to their environment and increase their chances of finding a mate. 

·        For example, slipper limpets start life as males and become female as they grow. Calyptraeid gastropods, a group of marine snails, change sex from male to female during their lifespan. 

·        Other species that exhibit sequential hermaphroditism include certain fish and plants.