Animals of the Pleistocene tended to be ____ than present day animals
a. Larger
b. Smaller
c. slower
d. more diverse
e. more ectothermic
a
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The radioactive element Unobtanium-189 (Ut-189) decays to the stable element Dilithium-171 (Di-171). The half-life of Ut-189 is 10 million years. Using a very sensitive atom-counter instrument, you determine that a mineral sample has 150 atoms of Di-171, and 50 atoms of Ut-189. Assume that no atoms have been lost due to metamorphism over the lifetime of the rock.Use this information to answer the following question.How many half-lives have passed since the mineral formed?
A. 1 B. 2 C. 3 D. 4
Managing crop competitors and pests has been challenging to agronomists for centuries. One approach, integrated pest management, ________
A) uses only synthetic chemical pesticides B) uses only natural pesticides C) uses no pesticides of any kind D) combines a variety of pesticides to combat the pest E) combines synthetic chemical pesticides with biocontrol techniques
Which of the following is not cited as a factor in helping to reduce air pollution?
A) use of more alternative, clean energy sources such as wind and solar B) increased vehicle fuel-efficiency C) uses of alternative and public transportation D) stricter air emission regulations E) increased use of coal as an energy source
Isolated knobs of resistant bedrock that rise up from desert pediment surfaces are called _____
a. bolsons b. badlands c. bajadas d. inselbergs e. base levels