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.
The Jellyfish Sting's the Thing. Jellyfish are carnivores -- they eat other animals. Smaller jellyfish eat algae and other tiny plankton called zooplankton. Larger jellyfish eat crustaceans and other bigger aquatic animals. They don't seek out people to attack -- their nervous system is too simple to do that.Their sting is both a defense mechanism and a way to capture their prey.maller jellyfish eat algae and other tiny plankton called zooplankton. Larger jellyfish eat crustaceans and other bigger aquatic animals. They don't seek out people to attack -- their nervous system is too simple to do that. Their sting is both a defense mechanism and a way to capture their prey.