Which question can be answered by an experiment?
A)
Do sugar substitutes cause cancer?
B)
Did an ice age kill off the mastodons?
9
What caused the extinction of the dinosaurs?
D)
Are all people susceptible to the Hunta virus?

What are some things that limit population growth?

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases