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?
- ACoronary arteries
- BValves
- CVentricles
- DAtria
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?
When a hedgehog is frightened, it rolls into a tight ball. Its sharp spines then stick out in all directions, protecting its soft belly. What does a hedgehog do when it is frightened?
A weather report says: “Today will be cloudy in the morning with sunshine in the afternoon. Tonight, expect light rain.” When is rain expected?
“The tide was coming in fast. The children, busy building their sandcastle, did not notice the water creeping closer and closer.” What is most likely to happen next?
“The nurse spoke softly, held the boy’s hand and explained each step before she gave the injection.” Which word best describes the nurse’s manner?
Grace wanted a dog, but her apartment did not allow pets. She began volunteering at an animal shelter on weekends, walking and feeding the dogs. What can you infer about why Grace volunteered?
A study compares two groups of patients after knee surgery. Group A did physiotherapy three times a week; Group B did it once a week. After two months, Group A could walk farther. The groups were similar in age and health at the start. Why does it matter that the groups were similar at the start?
A survey on a fitness website asked visitors, “How many days a week do you exercise?” Most answered five or more. The website reported, “Most adults exercise five days a week.” Why is this conclusion questionable?
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