Coefficients of Absorption for Common Materials
Perforated acoustic ceiling material 60%
Heavy curtains 50%
Carpeting 20%
Wood 5%
Plaster 3%
Clay tile 3%
Concrete 2%
The answer is C. Heavy curtains
I believe the answer is <span>D. High birth rates and low death rates leading to a expanding population. i am not positive but i am pretty sure</span>
A cell is the smallest unit of living matter
