Compare the development of a pond snail and a toothless snail. What is the biological

Compare the development of a pond snail and a toothless snail. What is the biological significance of different types of development?

Pond snail and toothless are both Molluscs, but reproduce and develop in different ways.
Pond snails are hermaphrodites. They are characterized by cross fertilization. Eggs, laid in transparent mucous cords, are attached to various objects or plants under water. Pond snails emerge from the eggs, which differ from adults in their small size and thin shell.
Unlike the pond snail, the toothless is a dioecious organism and its development proceeds with the larval stage.
Glochidia (larvae) are capable of swimming, but they attach under the skin of the fish, using them as providers and carriers. In this way, the toothless are spread over long distances.