The ancient remains of which of the following, buried before they could decompose, are the source of today's petroleum deposits?
A) Dinosaurs
B) Fish and amphibians
C) Land based plants
D) Microscopic organisms
E) Peat and coal
D
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Which part of the brain controls heartbeat and respiration?
A. the thalamus B. the cerebrum C. the brainstem D. the cerebellum
The silicon atom of the silica tetrahedron has a (+/-) ____________________ charge of
____________________ (number?) and the oxygen atoms have a (+/-) ____________________ charge of ____________________ (number?). Therefore, the ion group has an overall (+/-) ____________________ charge of ____________________ (number?). Fill in the blank(s) with the appropriate word(s).
Nuclear power plants ________
A) were first developed commercially in the early 1990s B) produce more greenhouse gas emissions than burning fossil fuels C) are illegal in France and Lithuania D) experienced the most growth during the 1970s and 1980s E) supply most of U.S. electricity
Humid subtropical climate regions have a pronounced dry season
Indicate whether the statement is true or false