I remember my mom telling me this answer the answer is they develop into the cells walls and the cell membrane :)
C. a hydrogen bond is the answer just took the test good luck on the res
This should be classified under "pseudocoelomates"
Ever wonder what that beeping noise is on a Submarine? That's the sound that people use to bounce off walls and stuff.
This is called sonar detection. It enables us to tell where things are in the water like a Dolphin!
Some solids does not have stuff fluid has