Its skin so it protects the internal organs and systems
A. can cats learn to sit down on command
<em>A megaphone used by a cheerleader can allow people on the opposite side of a field to hear her better because;</em>
D. Solid objects can change the direction of sound waves; megaphones allow users to determine the general direction of the sound.
<u>Determination of the general direction of the sound lessens its dispersion and thus, it reaches the observers at a higher intensity, hence it being louder.</u>
Flatworms have a concentration of never tissue and organs in one end of the body. That characteristic would be called, cephalization.
I hope this helps!!
