Which of the following molecules is(are) polar?
A) BCl3
B) NH3
C) both of them
D) neither of them
B
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The largest reservoir of unfrozen freshwater is
A. water in the atmosphere. B. groundwater. C. water in the biosphere. D. the water in all lakes and streams.
What do researchers use to directly measure the rate of productivity?
a. Carbon-12 b. Biomass c. Carbon-14 d. Chloroplasts
Squid swim by expelling water out a siphon to propel themselves ________
A) backward B) downward C) forward D) leftward E) rightward
A particular country's opportunities and advantages can be determined by various factors, such as
-a location providing greater access to world markets -arable land for farming -forests for timber & freshwater for fishing -the amounts of available natural or human resources -all of these are correct