_RI_8_4_a__Mob_2 (1).pdf

_RI_8_4_a__Mob_2 (1).pdf - Part 5 Common Core Practice...

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Part 5: Common Core Practice Lesson 10 Read the scientific account. Then answer the questions that follow. Animal Regeneration by Aleya Brown 1 Regeneration is the ability of an organism to regrow a lost body part. All creatures have the power to regenerate lost body parts to some degree. If a human scrapes a knee or breaks a bone, for example, tissue is regenerated to heal the wound. Even a lost fingernail will regenerate over time. If the finger is severed, however, the limits of regeneration have been reached; humans cannot regrow limbs or organs. In contrast, if an earthworm is cut in half, the end of the worm with a head can grow a new tail. If the end of the worm with the tail survives, it too may grow a new tail. Unfortunately, it starves to death eventually because it cannot feed itself without a head or mouth. 2 Which creatures have strong regenerative powers? Lower animals, such as worms, lizards, spiders, and starfish, have some of the greatest regenerative powers. Crayfish, for example, have a remarkable safety device at the base of each claw and leg called a "breaking joint." When a predator grabs a limb or claw, the appendage breaks away so the crayfish can escape. Over time, as the crayfish molts, or sheds its soft shell, the broken limb or pincer grows larger and larger until it has been completely regenerated.
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  • Fall '18
  • mr birk
  • Human Anatomy, Meaning of life, Aleya Brown

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