Abacterium closely associated with humans is known to be responsible for gastric ulcers and
stomach cancers. the genus of this bacterium is:
a. heliothrix
b. helicobacter
c. herpetosiphon
d. histophilus
e. herbaspirillum

Which of the following birds remained ancient looking in the miocene epoch? a. crows b. owls c. grouses d. none of the above

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

Plants that have reproductive structures called cones are?