Which of these protects the earth from harmful radiation when found in the stratosphere , but it a pollutant at lower altitudes

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

Nucleic acid certain protein cell membranes certain carbohydrates

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u. s. fish and wildlife service