Which of the following is NOT a contributing
factor to the great diversity of tropical
rainforests?
a. warm temperatures year round
b. structural complexity
c. their old age
d. nutrient poor soils
e. all of these are contributing factors
D
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Most scientists believe that the dinosaurs went extinct due to
a. runaway global warming. b. competition from early mammals. c. a meteorite impact. d. a pandemic disease. e. unknown causes.
Why would you predict that the blood carbon dioxide levels in a pregnant woman would fall?
A. The fetus is removing carbon dioxide from her blood. B. She has trouble breathing due to the expanding uterus. C. Pregnancy creates a favorable concentration gradient between the fetal and maternal blood. D. The bronchial tubes relax. E. The maternal oxygen levels are also falling.
Which element does not contain a neutron in its nucleus?
a. helium b. carbon c. oxygen d. hydrogen e. nitrogen
Briggs and King demonstrated nuclear transplantation in
A. frogs. B. fish. C. sheep. D. pigs. E. lizards.