Original sentence: Each colony grows  asexual budding from a single zooid known as the ancestrula.This occurs at the tips of "trunks" or "branches" in forms that have this structure
Edited sentence: Each colony grows  asexual budding from a single zooid known as the ancestrula, which is round rather than shaped like a normal zooid.. This occurs at the tips of "trunks" or "branches" in forms that have this structure