Sharks have lived in the oceans for millions of years. Unlike most fish, their skeletons are made of cartilage, the same bendy material found in your nose and ears. What are shark skeletons made of?
- ACartilage
- BThin shell
- CScales
- DHard bone
Sharks have lived in the oceans for millions of years. Unlike most fish, their skeletons are made of cartilage, the same bendy material found in your nose and ears. What are shark skeletons made of?
Digestion begins in the mouth. As you chew, saliva starts to break down some of the food, and your tongue helps form it into a ball that you can swallow. Where does digestion begin?
Drinking enough water helps the body control its temperature. Water also carries nutrients to cells and removes waste through the kidneys. Many adults need about two litres of fluid a day, and more in hot weather. According to the passage, how does water help remove waste?
Kelp is a type of large brown algae that grows in cold ocean water. Kelp forests provide food and shelter for many animals, including sea otters, which eat the sea urchins that feed on kelp. How do sea otters help kelp forests?
Many people believe that cracking your knuckles causes arthritis. However, several studies have compared people who crack their knuckles with people who do not and found no difference in arthritis rates. What is the author’s main purpose?
The clinic’s new online booking system lets patients choose appointment times at any hour. Since it was introduced, missed appointments have dropped from 12 percent to 7 percent. Which statement is supported by the passage?
“The nurse explained the new inhaler to Mr. Brown and then asked him to show her how he would use it.” Why did the nurse most likely ask him to demonstrate?
“The children’s hospital opened a play room. Since then, nurses report that children are calmer before procedures and need fewer extra staff to help hold them still.” What can be inferred about the play room?
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