The heart has four chambers. The two upper chambers are called atria, and the two lower chambers are called ventricles. What are the two lower chambers called?
- AAtria
- BVentricles
- CCoronary arteries
- DValves
The heart has four chambers. The two upper chambers are called atria, and the two lower chambers are called ventricles. What are the two lower chambers called?
The museum is free for children under 5. Tickets cost $8 for children aged 5 to 17 and $15 for adults. Seniors over 65 pay $10. How much does a ticket cost for a 70-year-old visitor?
The seasons change because Earth is tilted. As Earth travels around the sun, first one half and then the other half leans towards the sun and gets more direct sunlight. Why do the seasons change?
“Some people say that cats are unfriendly. My cat, Pepper, waits by the door every evening and sits on my lap while I read.” How does the writer use Pepper?
A line graph shows the number of visitors to a park each month. The line rises steadily from January to July, then falls from August to December. Which statement best describes the data?
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?
The hospital’s visitor policy states: “Visiting hours are 10 a.m. to 8 p.m. Two visitors per patient at a time. Children under 12 must be with an adult. Visitors with a cough or fever should not visit.” Which visitor follows the policy?
“The surgeon, who had performed the operation hundreds of times, still reviewed every step the night before.” What does this detail reveal about the surgeon?
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