A population of snakes includes solid-colored snakes and banded (striped) snakes. On the mainland, the snakes are mostly solid. On a nearby island, the snakes are mostly banded. You hypothesize that the reason for this observation is that the environments on the mainland and island are different, and banded snakes are favored in the island environment. Which of the answer choices are possible alternative hypotheses to explain why the snakes on the island are mostly banded? Select all that apply.

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 organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

How does the carbon cycle involve an exchange of carbon