Which of the following best describes how DDT use lead to a serious decline in the brown pelican population of Anacapa Island, California during the 1960's?
A) DDT was sprayed on the grasses and contaminated the pelican chicks that walked through the grass.
B) The pelican chicks ate insects that were contaminated with DDT which lead to chick mortality.
C) The adult pelicans ate DDT contaminated fish and died from eating the poisonous fish.
D) Adult pelicans could not produce normal thickness eggs due to DDT in their food supply.
E) DDT was sprayed on the nesting sites in an attempt to eradicate mosquitos on the island.
D
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The strategic importance of the Middle East is mostly related to
A. the tension between Israel and the Palestinians. B. its location along the international trade route between Europe and Asia. C. its enormous known reserves of petroleum. D. the interaction between moderate and radical Islamic states.
Cleavage is the tendency of a mineral to break along planes of weakness. The planes of weakness are a function of crystal form and
A) hardness. B) chemical bond. C) symmetry. D) crystal size.
Which of the following is a major component of kidney stones?
A) calcium glutarate B) calcium malate C) calcium oxalate D) calcium succinate
A structural downfold can occupy a topographic ridge
Indicate whether the statement is true or false