What are the signs characteristic of the first animals?

Typical signs of first animals: they have a cloaca like reptiles, lay eggs, body temperature up to +30 degrees and drops or rises, depending on the ambient temperature, by 5-6 degrees. They are fed with milk, which flows down the enlarged pores along the wool of the female and the cubs lick it. The body is covered with hair or needles. The first animals include the platypus and the echidna.

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