Option D is the correct answer.
To what extent has the presence of a true coelom in animals changed over the course of evolution?
A coelom is a body cavity that is formed from the mesoderm tissue.
Option D - The presence or absence of a true coelom appears to have changed multiple times during the course of evolution.
I think A in am not a 100%sure tell me if I am wrong.
It can be made of sand mud and pebbles
Transform boundary, meaning that they are pulled horizontally
Since there is a phosphorous, you can straight off know that it's a nucleic acid.
I'd say B.