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.
Overview. 1  The field of exercise science has grown and changed significantly over the last 50 years. Most colleges and universities now offer undergraduate degrees in exercise science, exercise physiology, kinesiology or physical education, and career opportunities for exercise specialists have expanded greatly.