How can we determine when an ice age has ended? A. When the thermocline evens out and the surface waters of the ocean warm.
B. Hadley convection cells reverse direction and bring warm air closer to the surface.
C. When the ice sheets in Greenland and Antarctica disappear completely.
D. When the ice sheets retreat from the equator to Greenland and Antarctica.

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

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.

Which of the following is not a potential result of deforestation?