Our skin makes vitamin D when it is exposed to sunlight. Vitamin D helps the body take in calcium, which keeps bones strong. What does vitamin D help the body do?
- ATake in calcium
- BDigest sugar
- CGrow more hair
- DFight off colds
Our skin makes vitamin D when it is exposed to sunlight. Vitamin D helps the body take in calcium, which keeps bones strong. What does vitamin D help the body do?
The Dead Sea, between Israel and Jordan, is so salty that people can float on its surface without trying. Very few living things can survive in its water. Why can people float easily in the Dead Sea?
A doctor uses a stethoscope to listen to sounds inside the body, such as the heartbeat and breathing. What is a stethoscope used for?
“Some people think that only children need vaccines. In fact, adults also need some vaccines, such as boosters for tetanus and a yearly flu vaccine.” What is the main point?
The human body has about 206 bones in adulthood. Babies are born with about 270, but many of them fuse together as the child grows. Why do adults have fewer bones than babies?
“After the hospital put hand sanitiser by every bed, staff used it far more often, and infection rates on the ward fell.” What can be reasonably concluded?
A bus timetable shows buses leaving the hospital at 7:15, 7:45, 8:15 and 8:45 a.m. The trip to the train station takes 25 minutes. A nurse must catch a 9:00 a.m. train. Which is the latest bus that gets the nurse to the station in time?
The author writes: “Students who eat lunch with friends are happier at school. Therefore, schools should give students more time for lunch.” Which unstated assumption does the argument depend on?
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