This causes pieces of the continental crust to crack and pull apart. Some slabs of the crust sink, causing a rift zone. If the lithosphere continues to spread, a narrow sea can form. Continued spreading produces an ocean basin and ridge system.
Confidence votes 3. a tiger is a mammal because they give milk to their young and produce milk. They breath the air form of oxygen and produce milk. They fulfil the criterion that need to be fulfilled by a mammal. Thse being that they are warm blooded, animals that give birth to live young and sucle them.
Like most mammals, tigers have five main senses: 1.Hearing. As avid hunters, tigers need to have acute hearing so that they are able to detect potential prey in the bushes and grasses around them. Many times, this foliage is dense, concealing the animal visually.