My go to quick-keto method is a coconut oil and cream fast. Basically just coffee, cream, and coconut oil for a day, top the day off with a bout of heavy weights before bed, tons of water, and I'm in ketosis in a day or 2.
Some well known gastropods, which are mollusks, are snails and slugs, and they exhibit what is known as BILATERAL SYMMETRY. The only other kind of symmetry that exists in the animal kingdom, with the exception of colonial species such as the sponge, is RADIAL SYMMETRY.
Terrestrial pulmonate snails have a hermaphroditic gonad producing egg cells as well as sperm cells. In a Roman snail's hermaphroditic gland, however, this happens at different times, so there can be no self-fertilization. On the other hand this exactly is what may happen in other snail groups (see below).