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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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
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