Answer:
They are too busy doing their own work
The characteristic of epithelial cells that makes them ideal for providing this type of protection is that the cells are packed tightly together.
Skin, the body's largest organ,is our first and best defense against external aggressors. The many layers work hard to protect us, however when its condition is compromised, its ability to work as an effective barrier is impaired.
Answer: Double-decker buses have heavy weights attached to their undersides. b The crane has a heavy concrete block attached to one end of its arm, ant others placed around its base.