In the early history of the earth, the solid surface of the earth weathered more rapidly than now because ________.
a. the early rain was very acidic
b. there were numerous earthquakes and volcanoes breaking up the surface
c. the rocks at the surface were weak because there was little oxygen available
a. the early rain was very acidic
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Ear infections, sore throats, eye irritations, and gastrointestinal disease may result from summing in waters with raw sewage.
Answer the following statement true (T) or false (F)
The ____________ ____________ is the uppermost layer of seawater lit by the sun, whereas the ____________
____________ is the permanently dark layer of seawater. Fill in the blank(s) with the appropriate word(s).
This is a sovereign state that comprises an urban area and the surrounding countryside.
A) rural-state
B) nation-state
C) city-state
D) primate-state
E) homogeneous state
Which of the following distinguishes a neurotransmitter from a hormone?
A) the diversity of compounds in the classification B) the chemical structure of the compounds C) the source of the compound D) the distance over which it acts E) all of the above