Explanation

Fertilisation and development in the earthworms occurs with in the cocoon. In the cocoon, mature sperm, egg cells and nutritive fluid are deposited. The ova (eggs) are fertilised by the sperm cells within the cocoon which then slips off the worm and then gets deposited on the soil. These cocoons holds the worm embryo. After three weeks, each cocoon produces two to twenty baby worms with an average of four