Save guides, add subjects and pick up where you left off with your BBC account. Every living thing changes as it goes through its life from birth to death. Some living things might not change very ...

As animals, they are subject to the cycle of life and death - though one species is known to bend the rules. This illustration shows the different life stages of Turritopsis jellyfish. Image via ...

Jellyfish are among the oldest animals on Earth ... conditions and influences transitions between different life stages. The complex life cycle begins with tiny larvae that settle on solid ...