Not many, except for one small group of mammals called Monotremes, that include not only the platypus, but the echidna (pictures in my source).
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The platypus lays eggs due to evolution to protect its babies.
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Platitupusi are the only mammals to lay eggs
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For the VAST majority, no. The only mammal that lays eggs is the platypus.
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the platypus and the spiny anteater do. Both native to Australia.
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No. However, there are exceptions such as the duck billed platypus.
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The platypus is the only mammal to lay eggs.
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Some do, such as the duckbill platypus.