The graph shows three different projections of human population growth.
If you assume that the high projection is correct, what is one way the larger human population can ensure it has enough food?
A. By finding more efficient ways of growing crops B. By learning to eat a lot less food C. By focusing more on ideas and services D. by returning hunting and gathering

Answer:

C. By focusing more on ideas and services

Explanation:

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A scientist is studying PCBs in tertiary consumers. She wants to determine if PCBs can be found in tertiary consumers even though these compounds were banned in the United States in the 1970s. Which of the following best identifies a testable hypothesis for the study?
a. PCBs are highly soluble in water, sok is unlikely that the compounds will be found in the liver or kidneys of tertiary consumers because the compounds have been banned
b. PCBs are persistent organk compounds that are fat-soluble, so they should be found in the fatty tissues of tertiary consumers even though the compounds have been banned for decades.
c. PCBs have synergistic effects with other toxins in the environment and are broken down in water and soll, so most tertiary consumers are not directly exposed to them
d. PCBs are acutely toxic to most forms of ute and quickly kill most organisms upon exposure therefore, tertiary consumers today would be expected to have high levels of the compound in the tissues