In snails, individuals can change sex, indicating that sex is not genetically determined in them.
The correct option is A True There are several strategies for determining the sex of individuals. In some individuals, sex is determined by genetic factors. In some individuals, sex is determined by environmental factors. The temperature at which fertilised eggs are kept will determine the sex of newborn. In other animals like snails, individual can change sex. They change sex at some point during their lives. The phenomena are called as sequential hermaphroditism. It is also called as dichogamy. The snail is born as a male but eventually changes into a female. Snails use physical contact with other snails to guide sex change. When pairs of snails are in direct contact with one another, the larger snail will transit from male to female and the smaller snail will likely to stay male.