The hydra has a nervous system characterized by a nerve net. A nerve net is a collection of separate, but "connected" neurons. Neurons are connected by synapse. Communication between neurons can be in both directions at the synapse within a nerve net. The nerve net is concentrated around the mouth. Unlike higher animals, the hydra does not have any grouping of nerve cell bodies. In other words, there are no ganglia.
The hydra does have specialized cells for touch and chemical detection though.
The reason why there are fewer christians in northern Africa is because the culture in Africa is different from christianity.
Answer: pore or fluid
Explanation: The pore or fluid pressure is the pressure of the fluid within the pores of a given rock. The pore pressure can result in a situation known as overpressure or high pore pressure when the pore pressure becomes higher than the hydrostatic pressure.
Sedimentary materials are particles which have been accumulating over a long time and have been cemented together through temperature and pressure etc.
<span>Wegener had the evidence that there are similar rock formations on different continents and that the shape and rock formations of continents on either side of an ocean fit quite nicely. However, he could not find the mechanism that caused the continents to move across the ocean floor. I hope this helps. :)</span>
