How does the absorption of ultraviolet radiation by the ozone layer sustain life? a. this process maintain the temperature of the earth. b. it keeps a low level of harmful ultraviolet radiation from reaching living organisms. c. this process keeps ozone concentrations in the troposphere at lower levels. d. all of the above are true.

the answer to the  question is D

well schools are being forced to embrace computers. unlike their "digital immigrant" teachers, these students are "digital natives", born into a world where technology is an integral part of everyday life. almost every student has access to a multitude of computers, laptops and tablet devices. it would be crazy to assume an assignment would  not be written on computer in this day and age.

don't delete this trying to