Search Results for: Crustaceans simply prepared
possess a complete digestive tract, but in protostomes the first opening of the embryonic gut develops into the mouth, and the anus forms secondarily. in deuterostomes, the anus forms first while the mouth develops secondarily. [ ] [ ] most protostomes have schizocoelous development , where cells simply
animals , [d] based on his own observations, into those with blood (roughly, the vertebrates) and those without. the animals were then arranged on a scale from man (with blood, legs, rational soul) down through the live-bearing tetrapods (with blood, legs, sensitive soul) and other groups such as crustaceans...
https://en.wikipedia.org/wiki/Animal