What is the petroleum found in marine sediments likely to have been formed from?
A) Bacteria
B) Fossilized fish
C) Whale falls
D) None of these choices
A
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________ organisms live in the marine ecosystem above the sea floor. Fill in the blank(s) with the appropriate word(s)
In the past 40 years, pesticide use has tripled yet pests still cause extensive damage to crops. Why has this increased use of pesticides not been more effective?
A) The pesticides in use today are much less powerful due to government regulations. B) The pesticides available are no longer suited for the most common types of pests. C) Increases in ultraviolet radiation and global warming break down pesticides faster. D) The widespread use of pesticides has resulted in the evolution of pesticide resistant pests.
Southeast Asian countries export a large portion of their palm oil production, sending much of it to which areas?
A) United States B) South America C) European Union D) Australia E) Russia
What are the disadvantages of using biomass as a means to calculate primary productivity? What are some other means used to measure this productivity?