Homework Answers
Answer -none of the above
1. Commonly all mammals have four kinds of teeth. However, there are exceptions like rodents. Mammals are diphyodont( 2 sets of teeth in a lifetime), heterodont (different types of teeth). All mammals feed young ones.
2. All mammals do not lay eggs. Platypus lays eggs.
3. Radial symmetry is the characteristics of lower orders; bilateral symmetry provides defined movement.
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