Semi-open circulatory system
Ramin Amirmardfar
Broschiertes Buch

Semi-open circulatory system

Crabs and insects are an arthropod and both have exoskeleton. Why the crabs are larger than insects?

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Zoologists put all animals in the three groups: 1) Lack the circulatory system 2) Open circulatory system 3) Closed circulatory system But for the first time, I use the term "semi-open circulatory system" and put the animals in four groups. 1) Lack the circulatory system 2) Open circulatory system 3) Semi-open circulatory system 4) Closed circulatory system Why did I do that? This classification helps to better reveal the relationship between the power of the circulatory system and the body size of the animals. This is a missing chain link in the classification of animals. Why scientists befor...