Cnidaria (/naÉªËdÉÉriÉ/[4]) is a phylum containing over 10,000[5] species of animals found exclusively in aquatic (freshwater and marine) environments: they are predominantly marine species. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey.
Exercise Science is a multifaceted field of study in which movement or physical activity is the intellectual focus. This includes exercise of improvement of health and physical fitness and activities of daily living, work, sport, and play.
exercise. 1  active use or operation; employment: the exercise of an option. 2  performance (of duties, functions, etc.) 3  activity for the purpose of training or developing the body or mind; systematic practice; esp., bodily exertion for the sake of health.