Any practices should best be based on a research - this is the correct answer. (a. child development and research) Research is the best source of actual knowledge, rather than people's best guesses (people's best guesses might lead government regulations, but it would be better if they also followed research results.).
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Explanation:
The four American presidents that are displayed in the Mount Rushmore Natinal Memorial are: George Washington, Thomas Jefferson, Theodore Roosevelt y Abraham Lincoln.
Currently 7% of the world is covered by rainforests. About 50 years ago it was covered in 14% of rainforests. Not so sure how it would be a 100 years ago
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<em>The Secretary of State is the president's chief advisor on </em><u><em> foreign affairs</em></u><em> Thomas </em><u><em>Jefferson</em></u><em> and Colin </em><u><em>Powell</em></u><em> are among America's former Secretaries of State.</em>
Explanation: