When sound waves hit a solid surface they either reflect, refract, or absorb.
Echo's are caused by the reflection of sound waves.
The answer is:
the change in red blood cell volume is principally due to the movement of WATER.
Answer:A set of five nitrogenous bases is used in the construction of nucleotides, which in turn build up the nucleic acids like DNA and RNA. These bases are crucially important because the sequencing of them in DNA and RNA is the way information is stored.
Because secondary sucession has bas soil that is intact still unlike primary sucession which begins with virtually lifless area without soil
