February 27th, 2017 Hiroshima by: John Hersey

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Directions: ANSWER USING COMPLETE SENTENCES! Use the information you have been given to answer questions about: The Skeletal System: What bones are made of.

*To improve your MATH SKILLS spend at least 20 minutes practicing them using IXL.COM. (REMEMBER TO ENTER YOUR USER NAME AND PASSWORD WHEN LOGGING ON! THAT WILL BE PROOF THAT YOU DID IT!

Level #1

Bones are made of both living and nonliving materials. The living materials are bone cells, blood cells, and nerve cells. These cells make up about one-third of bones.

1. What are bones made of?





2. What are the living materials that bones are made of?





3. How much of these cells are our bones made of?







Level #2

Bones are made of both living and nonliving materials. The living materials are bone cells, blood cells, and nerve cells. These cells make up about one-third of bones. About two-thirds of bones are made up of nonliving materials, including the minerals calcium and phosphorous. The skeleton of an unborn baby is made of cartilage. This tissue is tough but flexible.

1. What are bones made of?





2. What are the living materials that bones are made of?





3. What are the nonliving materials that bones are made of?





4. What is the skeleton of an unborn baby made of and how would you describe it?








Level #3

Bones are made of both living and nonliving materials. The living materials are bone cells, blood cells, and nerve cells. These cells make up about one-third of bones. About two-thirds of bones are made up of nonliving materials, including the minerals calcium and phosphorous. The skeleton of an unborn baby is made of cartilage. This tissue is tough but flexible. As an unborn baby develops, most of its cartilage skeleton changes to hard bone. The cartilage that is left has many functions. For example, it prevents the ends of bones from rubbing against each other.

1. What two types of materials are bones made of?





2. Describe both the living and nonliving materials that bones are made of.






3. Describe the skeleton of an unborn baby, what happens to it as the baby develops, and the function of the cartilage that is left.







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