Which of the following alcohols could be the alcohol portion of a wax?
A) ethylene glycol, C2H4(OH)2
B) glycerol, C3H5(OH)3
C) 1-triacontanol, C30H61OH
D) none of these
C
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What determines the number and composition of the populations in a community?
A) Food B) Light C) Space D) All of these choices
Large populations have less genetic diversity than small populations.
Answer the following statement true (T) or false (F)
Which of these descriptions best fits the Pleistocene?
a. warm, humid period of swamps and forests when dinosaurs roamed Earth b. most recent climate interval characterized by warm, stable conditions c. four major glacial cycles slowly followed by shorter, warmer interglacials d. complex record of climate changes characterized by cycles of rapid advance and retreat of glaciers e. a period of steadily increasing temperatures
The composition of soil is best described as
A) approximately 45% organic matter, 50% mineral matter, and 5% water and air. B) roughly 45% mineral matter, 5% organic matter, and 50% air and water. C) pebbles, gravel, cobbles, and a varying combination of sands, silts, and clays. D) the very thin surface layer rich in organic matter with some other mineral matter in the mix. E) primarily mineral matter (approximately 72%), but also consists of organic matter (10%), and water (18%).