The amount of heat energy required to raise the temperature of a unit mass of a material one degree is
a. absolute zero.
b. a joule.
c. its heat capacity.
d. a btu.

i believe the answer is a.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

the ratio of the conjugate base to the acid required to attain the desired ph.