The Earth’s atmosphere became enriched in O2 during the ____
a. Devonian
b. Cambrian
c. Mesozoic
d. Proterozoic
e. Cenozoic
d
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Primary production includes everything except
A. minerals B. fish C. pharmaceuticals D. timber
Two cities are located at the same latitude (40 degrees C). City A is in the Southern Hemisphere and City B is in the Northern Hemisphere. Assume the two cities reflect the general characteristics of the hemisphere where they are located. Which city should have the warmest winter temperatures?
City A City B both cities should have nearly identical winter temperatures more information is required to answer the question
It may sound strange to hear that the ________ is generally lower for less developed countries than for more developed countries, but the difference is correlated to the average age of each population
A) crude birth rate B) crude death rate C) infant mortality rate D) natural increase rate E) total growth rate
A large number of fish are suddenly found floating dead on a lake. You are called in to investigate the problem. You find an abundance of phytoplankton and no evidence of toxic dumping. Suggest a reason for the fish kill
What will be an ideal response?