Epithelial cells are packed tightly together. The cells form a continuous sheet forming a barrier between internal organs and the outside environment. It protects the tissues that lie beneath from physical trauma, invasion of pathogens, toxins, radiation, desiccation etc.
By changing their tone, and volume at unexpected situations
Answer:
I think people believed that because they did not know, because they see the Sun move and not the Earth, that is what I think.
Movement concepts (or elements of movement) explored in the curriculum include body awareness, spatial awareness, effort awareness, and relationship to/with objects, people and space. Movement strategies refer to a variety of approaches that will help a player or team to successfully achieve a movement outcome or goal.