Hydra, a small freshwater animal, has a basic nervous system. It does not have a brain, but it can still do things like eat. Scientists are studying how Hydra's nerve cells connect and work together. They call this process self-assembly. It means that nerve cells organize themselves into working groups without a pre-set plan.

The N4 nerve circuit in Hydra is key for feeding. This circuit forms in embryos through a process driven by calcium activity. This activity helps nerve cells connect and sync up over time. Special connections called gap junctions and tiny bubbles that carry messages help speed up this process. The future mouth area of the embryo has the most nerve cells.

Scientists made a computer model to show how these connections change and sync up over time. They found that things like temperature and the presence of helpful germs can change how the nerve circuit forms. This shows that Hydra's nerve system can adapt to its environment. These findings suggest that the basic design of nerve systems might be the same in many animals.

Hydra lives in places where temperature and germs can change a lot. So, understanding how Hydra adapts can help scientists learn more about how animals evolve and cope with changes in their environment. This research gives a new angle on how simple nerve systems work and how they can change based on what's happening around them. It also shows that even simple animals have complex ways of dealing with their surroundings.

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