Which of the following is an essential role played by large intestine bacteria?
a. produce gas
b. absorb bilirubin
c. synthesize vitamin k and b-complex vitamins
d. synthesize vitamins c and d

Science which of the following is an example of a cyclic behavior that is seasonal? i think the answer is d, i just need to double check : ). a. running from predators. b. searching for water. c. hunting at night. d. migrating for warmth. ***