The animals Diaries
https://www.facebook.com/iamrobertmccormickAnimals from the two groups have a complete digestive tract, but in protostomes the first opening in the embryonic gut develops in to the mouth, plus the anus sorts secondarily. In deuterostomes, the anus varieties 1st although the mouth develops secondarily.49. A Rhinoceros‘s horns are made of ‘kerati