A septic system is ________
A) a rural method of handling sewage
B) the use of natural wetlands to cleanse wastewater
C) a toxic or badly polluted waterway
D) an early version of a wastewater treatment plant
E) a second level mechanism to remove bacteria at a wastewater treatment plant
A
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Earth's core is likely to be ____
A)composed of rock with high silica content B)hollow C)molten throughout D)composed of potassium and aluminum rich silicates E)composed primarily of iron
Isotopes are the forms of an element that differ from one another by having different ____.
A. atomic numbers B. numbers of electrons C. numbers of protons D. mass numbers E. electrical charges
A hypothesis that explains how new organisms or new characteristics can appear suddenly in the fossil record is called
A. evolution. B. punctuated equilibrium. C. natural selection.
Of the many factors that affect the basil metabolic rate, the MOST important factor is:
A) the person's age. B) the person's sex. C) the person's level of activity. D) the person's body surface area.