Shells evolved from ribs. ... Turtles and other shelled creatures use shells like shields to protect themselves from predators, or animals that hunt them. Turtles probably needed a shield on their backs and stomachs because they faced predators in the ocean from both above and below.
Skim the passage and find key words. if you have a word bank or vocab list, find them and highlight or underline them. look for repeating words and try to figure out why they appear often. usually the repeating words are important to the passage.
