When do the features that distinguish backboned animals from one another develop compared with our common "tube within a tube" body plan?
Features of “tube within tube” are present inside all the species that have a backbone. These would be present in amphibians, fishes, birds, reptiles as well as mammals. These features would be appearing early in the development of the individuals. These would be forming iwntin the first three weeks of conception, where the cells would be forming causing the tissues to be moving as well as folding. This tube would be forming early in life and would be present in the body of these individuals for their entire life.
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