A small zoo has 12 fishes in its aquarium, 5 frogs, 4 tortoises, 2 crocodiles, 7 pigeons and 3 deer.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A small zoo has fishes in its aquarium, frogs, tortoises, crocodiles, pigeons and deer. How many heart chambers do all the animals have together? How many of them have four-chambered hearts, and how many are warm-blooded?
Need a reminder? The key ideaShow
Fishes have 2 heart chambers, amphibians 3, most reptiles 3 (crocodiles 4), birds and mammals 4. Only birds and mammals are warm-blooded. Reptiles have dry skin with scales; birds have feathers, pneumatic bones and air sacs; mammals have hair, pinnae and mammary glands, and most are viviparous, but Ornithorhynchus lays eggs.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Chambers. .
Step 2. Four-chambered hearts. The crocodiles, pigeons and deer: .
Step 3. Warm-blooded. Only the pigeons and the deer: . The crocodiles have four chambers but are cold-blooded.
Answer: chambers in all; four-chambered hearts; warm-blooded animals.
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