What are the main stages of the evolution of the chordates that ensured their heyday and life on land?
| May 29, 2020 | Education
1) the formation of horny integument, feathers and wool;
2) the appearance of cellular lungs and two circles of blood circulation with a complete separation of blood into venous and arterial;
3) reproduction on land;
4) the formation of lever limbs;
5) the formation of a complex nervous system.
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