Replies to: What does credit hours mean? A class is usually 3 to 5 credit hours, which roughly refers to the number of hours of lecture per week. For example, a 3-hour class would meet MWF for 50 minutes or TuTh for one hour and 15 minutes. A 5-hour class might meet everyday for 50 minutes, e.g. foreign languages.
The answer is not as complicated as some people may think and yet the method is very effective, even fatal to the predator at times. All jellyfish have tentacles which they use to not only navigate and sometimes swim depending on the species but to also protect themselves from harm.These tentacles are used by the jellyfish to sting those who are preying on them.he answer is not as complicated as some people may think and yet the method is very effective, even fatal to the predator at times. All jellyfish have tentacles which they use to not only navigate and sometimes swim depending on the species but to also protect themselves from harm.
Jellyfish belong to the Phylum Cnidaria. They are invertebrates and are made up of 95% water. Jellyfish do not swim, but drift with the tides. For that reason, some people consider them to be plankton. They have no heart or brains. Jellyfish have specialized stinging cells, called cniodocytes. Each of these cells contains a nematocyst which acts like a mini-harpoon. When a jellyfish touches something the nematocyst is released and injects toxin into the prey.