| Many species inhabited shallow aquatic environments and some may have been amphibious, emerging onto land for at least part of their life cycle. |
| The life cycle of leukaemia cells is well understood, making it relatively easy to spot changes in behaviour. |
| American lobsters have a complex life cycle that involves a 3-10 week free-swimming larval stage in surface water. |
| The life cycle of the tapeworm can be readily completed under laboratory conditions. |
| Many products have been redesigned and relaunched as they have gone through their life cycle, yet their brand name has remained unchanged. |
| The phytohormone ethylene plays roles in physiological processes throughout the life cycle of the plant. |
