Which option identifies the factor and reason related to increases in skin cancer in the following scenario. over the the years humans are increasingly exposed to uv-a and uv-b rays, making them more vulnerable to developing skin cancer. a. use of aerosols that deplete the ozone layer b. use of cloud seeding that depletes the ozone layer c. thinning of the thermosphere that lets in more sunlight. d. thickening of the stratosphere that lets in more sunlight

Neelaredoxin is a 15-kda protein that is a gene product common in anaerobic prokaryotes. it has superoxide-scavenging activity, and it is constitutively expressed. in addition, its expression is not further induced during its exposure to o2 or h2o2 (silva, g., et al. 2001. j. bacteriol. 183: 4413–4420). which of the following statements best describes neelaredoxin synthesis? a-neelaredoxin is produced at all times; levels are constant even when exposed to o2 or h2o2.b-neelaredoxin is produced at all times; exposure to o2 or h2o2 increases expression. c-neelaredoxin is produced at all times; exposure to o2 or h2o2 decreases or prevents expression. d-neelaredoxin is only produced when there is exposure to o2 or h2o2.