Answer:
Cnidarians are not considered to have coelm ecause they are diploblastic, so they don't have any mesodermic tissue.
Aristarchus’s model not accepted because at that time it was believed that the earth was at the center of the universe.
<h3>What is Aristarchus’s model?</h3>
Aristarchus make a model by placing the place of the Sun in the middle of the solar system and placed the planets around the Sun.
So we can conclude that Aristarchus’s model not accepted because of the believed that the earth was at the center of the universe.
Learn more about model here: brainly.com/question/723406
The lysosomes are responsible for that
The geological features were different. And humans development was different.
