Why are the atomic masses listed in the periodic table not whole numbers?
A) Scientists have yet to make the precise measurements.
B) That would be too much of a coincidence.
C) The atomic masses are average atomic masses.
D) Today's instruments are able to measure the atomic masses to many decimal places.
C
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Pleistocene glaciers covered about three times as much of Earth’s surface as glaciers do now. Indicate whether the statement is true or false
Cruisers are thought to have relatively high body temperature because ________
A) it assists them in predator avoidance B) it helps them blend more easily with their environment C) it increases the power output of muscle tissue D) they are cold blooded E) they only need to move periodically
Which of the following has the highest boiling point?
A) butane B) propanal C) ethyl methyl ether D) 1-propanol
Which of the following statements regarding variations in Earth's orbit is true?
A. their combined effect on past global temperatures is purely hypothetical. B. even together, they don't produce enough temperature change to cause an ice age. C. they can fully account for the recent rise in global temperature. D. their effect on global temperatures was only recently discovered by NASA scientists. E. all of the answers listed here.