B amniotic eggs which is one of the similarities they share with birds (one of the many similarities and cause birds and reptiles to be on the same branch)
When sound waves hit a solid surface they either reflect, refract, or absorb.
Echo's are caused by the reflection of sound waves.
Answer:
D.
Explanation:
<em>It izz wat it izzzz!!!</em>
<em> </em><em>:)</em>