MediumBiologyHigh School (9–10)GeneralDiversity of Living Organisms › Plant and Animal KingdomsConceptual
A dolphin lives in the sea and has the shape of a fish.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A dolphin lives in the sea and has the shape of a fish. Give three reasons why it is a mammal and not a fish.
Need a reminder? The key ideaShow
Pisces: scales, gills, 2 chambers. Amphibia: moist skin, 3 chambers. Reptilia: dry scales, 3 chambers (4 in the crocodile). Aves: feathers, 4 chambers, warm-blooded. Mammalia: hair, milk, 4 chambers, warm-blooded.
The worked solution
Have you tried it?
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. Breathing. It breathes air with lungs, through a blowhole, not with gills.
Step 2. Young. It gives birth to live young and feeds them on milk.
Step 3. Body. It is warm-blooded, with a four-chambered heart, and it has a few hairs when young.
Answer: lungs, milk for live young, and a warm body with a four-chambered heart.
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