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Look at the second part under the underlined section

Explanation: There's an option saying "Animals in a rainforest can be difficult for scientists to find."

There's a section in the text saying: "Even with so many resident animals, rainforests are so dense, that the creatures can easily remain hidden, making it hard to tell the well being of any one animal species."

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.