Therefore, the two entrances of the burrow are at different pressures. This slight pressure difference causes the air to flow through the burrow as shown in the diagram. Bernoulli's Principle . Holding Fast at Sea Sea anemones are carnivorous marine animals found below the water surface along all seashores. They have tentacles, which they use to catch food and transfer it to their mouths.
Most sea anemones attach themselves to hard surfaces, such as rocks and other animals.
They depend on the flowing water to bring them food and nutrients. However, if the flow becomes too fast, the anemones will be dislodged from the surface and swept away. In order to avoid being washed out to sea, sea anemones have developed the ability to shrink in order to reduce the force of water on their bodies. As they shrink, the force from the flowing water becomes smaller and will not dislodge them. They also have the ability to expand their bodies to increase the area exposed to the flow.