1. Simple squamous epithelium
The cells are flat and only one layer.
2. Simple cuboidal epithelium
The cells are cuboid and only one layer.
3. Simple columnar epithelium.
The cells are columnar and only one layer.
4. Stratified squamous epithelium
The cells are flat and containing several layers.
5. Stratified cuboidal epithelium
The cells are cuboid and containing several layers.
6. Stratified columnar layer
The cella are columnar and containing several layers.
Their bodies taper to points at both the snout and the tail, reducing water resistance. Also decreasing drag -- and therefore noise -- are dermal denticles, sharp scales that cover the skin of most shark species. Rather than bone, sharks have cartilage, which is much lighter and more flexible. In addition, their livers produce squalene, a fatty oil that helps them remain afloat. Their pectoral fins allow them to quickly change direction, dive and swim upward.
http://animals.mom.me/unique-adaptations-sharks-survive-7845.html
Answer:
It depends entirely on an equation, certain equations are meant to confuse you with numerous answers so taht you have to narrow it down, some only have one or a few. It really depends on the type of problem
Coral snakes imitates king snake-mimicry
also body coverings such as fur on a bear
