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 starfish prises open the shells using its arms and tube feet and then everts part of its stomach through the gap, only a narrow gap is needed with some species only needing a gap of 0.1mm. The hold can then be relaxed and the shell allowed to close trapping the stomach which comes to no harm.he group includes: 1  Class Asteroidea-Starfish / Sea Stars. 2  Free moving echinoderms where the body is comprised of rays or arms radiating from a central disc. usually 5 armed, but can be 7-14 in some species and up to 40 in others.