Fill in the table “Comparative characteristics of the classes of vertebrates”.

Signs Fish Amphibians Reptiles Birds Mammals
Tep’s veils Scales Glandular integuments Horny Per’evoy Wool
Respiratory system Gills Light and code Lungs Lungs Lungs
Number of circles of blood circulation 1 2 2 2 2
Number of chambers in the heart 2 3 3 4 4
Cold blooded or


Cold blooded Cold blooded Cold blooded Warm-blooded Warm-blooded
Feature of the brain Well developed midbrain More developed hemispheres Well-developed forebrain The cerebellum is well developed Large hemispheres are well developed
Fertilization, external or internal Outdoor Outdoor Internally Internally Internally
The place of the beginning of the development of the embryo roe egg egg egg mother’s body
Caring for offspring No No No Yes Yes
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