You see jellyfish adapted to not having a brain but they still have a nervous system. This nervous system goes to there tentacles which helpes jellyfish detect tempatures, touch, food etc.
If that did help i would gladly accept brainliest thanks duded and have a great day!
Estuaries are areas where fresh water from rivers meets salt water. As the river drains, it carries much nutrient-rich sediment. Many animal species depend on this food source to provide for their young.