Things to know about Octopus || Science

Octopus

Octopus are very old species. They are soft - body sea animals. Around ~300 species of octopuses are recognised and the order is grouped with in the class Cephalopoda with squids, cuttlefish and nautiloids. 

They are living on planet Earth about ~ 300 million years. Octopuses have three hearts, 2 hearts move blood beyond the his Gills whereas third circulates it to the organs.

Octopuses also have nine brains, they have one main brain which takes most decisions and eight brains, one in each of there arms. 2/3rd of their neurons reside in arms, there arms can separately work when the main brain is busy.

Human blood is red because of hemoglobin which carries Oxygen through the blood stream. But the octopus have Blue Blood there blood has copper - rich Hemocyanin which carries oxygen from lungs to the bloodstream.

•  Order - Octopoda; Leach, 1818
• Lifespan - Giant Passafic Octopus 3 - 5 years
• Phylum - Mollusca
• Class - Cephalopoda
• Scientific name - Octopoda

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In Hindi - https://starouthindi.blogspot.com/2020/08/Octopus-in-hindi.html?m=1