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• which describes oxygen content as earth evolved over time? oxygen levels sharply declined about 400 million years ago. oxygen levels stay above 15 percent starting 200 million years ago oxygen levels remain below 5 percent starting 1000 million years ago. oxygen levels raise significantly between 1000 and 700 million years ago.
  
• jerry prefers to burn bituminous coal in his fireplace because of the yellow flame. what causes that flame color?
  
• in order to maintain optimal community health, the best plan for communities would be to __________. a. decrease vaccinations and research new treatments and cures b. create laws that control public behavior, like hand washing and blowing your nose c. provide community support to elders who are sick and need healthcare treatment d. provide health services and regulate food and water supplies
  
• have you ever been at sea in a dense fog, when it seemed as if a tangible white darkness shut you in, and the great ship, tense and anxious, groped her way toward the shore with plummet and sounding-line, and you waited with beating heart for something to happen? i was like that ship before my education began, only i was without compass or sounding-line, and had no way of knowing how near the harbour was. —the story of my life, helen keller based on the passage, how does helen keller feel about her education? check all that apply. it made her feel lost. it helped her understand ships. it gave her knowledge. it made her anxious. it gave her direction.
  
• the first documentary was created by ______(1)______. it documented ________(2)________
  
• on a coordinate plane, line segment a b goes from (negative 4, 3) to (negative 1, 1), segment d c goes from (1, 1) to (4, 3), segment f e goes from (3, 1) to (6, 3), segment h g goes from (negative 4, negative 3) to (negative 1, negative 1), segment i j goes from (negative 4, negative 5) to (negative 1, negative 3).which segment is a reflection of segment ab over the line x = 1?line segment c dline segment e fline segment g hline segment i j
  
• what was the goal of the marshall plan? a. to use military force against any pro-communist european nation b. to provide funding to rebuild parts of europe after world war ii c. to isolate china and prevent communism from spreading in asia d. to prevent spies from collecting classified information for the soviet union
  
• a firm that manages to avoid competition entirely by offering a product or service that creates an uncontested market space is engaging in
  
• in order to be properly inspected, firewalls may send data to a middleman called a service.
  
• what is the best description of the role of women in athens? women were allowed to own property, but they could not vote. women were considered full citizens even though they could not vote. women were confined to taking care of the home and their children. women were lumped in with enslaved persons and free men in their roles.