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 do not have a specialized circulatory system, but they use diffusion as a way to circulate materials throughout their body. Almost every cell is in contact with the environment and so they are in direct contact with the nutrients and materials they need.ea anemones breath and circulate oxygen through the main opening in the middle, which is used as a mouth. Once inside the oxygen, food, and materials are directly taken by the cells on the inside of the sea anemone.