Solution A has a pH of 6 and solution B has a pH of 8. Which of the following is true regarding the
concentration of hydrogen ions in each solution?
a. A has 100 times greater H+ concentration than B.
b. B has 100 times greater H+ concentration than A.
c. A has 7/9 of the H+ concentration of B.
d. A has 9/7 of the H+ concentration of B.
e. A has 1,000 times greater H+ concentration than B.
A
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About 2/3 of a shark's brain is used for:
a. control of body movement. b. processing electrical currents from the water. c. olfaction. d. vision. e. processing water pressure differences.
The scientific study of the diversity of organisms and the evolutionary relationships between them is referred to as:
a. ecology. b. taxonomy. c. systematics. d. evolutionary biology. e. biological classification.
In ____________, fats accumulate on the inner walls of the arteries, narrowing the diameters of arteries and also leading to elevated blood pressure.
A. a heart murmur B. Purkinje fibrosis C. erythrocytosis D. atherosclerosis
What do scientists who support the Miller and Urey model of the formation of the first organic molecules on Earth have in common with those scientists who support the hypothesis that organic molecules arrived on early Earth carried in a meteorite?
A) Both support the idea that the first organic molecules on Earth had their origins in outer space. B) Both support the idea that conditions on early Earth led to the formation of organic molecules in the atmosphere. C) Both support the idea that the first organic molecules on Earth were formed from inorganic molecules. D) Both support the idea that only living things can produce organic molecules.