Of the following, is the smallest mass. 2.5 ×10^−2 mg
25 kg
2.5 ×10^15 pg
2.5 ×10^9 fg
2.5 ×10^10 ng

25kg is the largest mass.

Explanation:

Convert all the masses to kg so that the units would be uniform

1mg = 10^-6kg

2.5×10^-2mg = 2.5×10^-2×10^-6 = 2.5×10^-8kg

1pg = 10^-15kg

2.5×10^15pg = 2.5×10^15×10^-15 = 2.5kg

1ng = 10^-12kg

2.5×10^10ng = 2.5×10^10×10^-12 = 0.025kg

1fg = 10^-18kg

2.5×10^9fg = 2.5×10^9×10^-18 = 2.5×10^-9kg

a is the answer to this question

explanation:

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.