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• what is expected to happen to the number of people sixty years and older in the developed world by the year 2050? to what can this be attributed? (site 1)
  
• at a game show, there are three doors marked 1, 2, and 3. a contestant is allowed to select one of three keys labeled a, b, and c and then use it to open one of the doors. the sample space showing the ways in which a contestant can select a key and a door is represented in the table. door 1 2 3 key a a-1 a-3 b b-1 b-2 b-3 c c-1 c-2 c-3 what is the missing term in the table? if there were two doors instead of three doors, what would the sample size be? a. the missing term is a-2. the sample size would be 6. b. the missing term is c-2. the sample size would be 8. c. the missing term is c-2. the sample size would be 9. d. the missing term is b-2. the sample size would be 12.
  
• what did the world learn from the cuban missile crisis? check all of the boxes that apply. nuclear war was a real possibility. the soviet union would use force to defend cuba. cuba was willing to compromise with the united states. the united states would stand up to soviet influence in the americas.
  
• identify each of the highlighted materials as an element, a compound, or a mixture, and explain your reasoning.
  
• the prologue of romeo and juliet introduces which elements of the play? select 4 options. the setting of a lovely city the setting of a house’s courtyard the setting of a family tomb the characters of the lovers the characters of the lovers’ parents the conflict of a grudge between the two families the conflict of a fight between the two lovers
  
• eubacteria are classified by . are round bacterial cells. are rod-shaped bacterial cells. are spiral-shaped bacterial cells.
  
• hepaticophytes lack stomata and tracheids. what would provide evidence to justify their inclusion in the bryophytes and not the charophytes?
  
• nina studies an artificial heart model. the model has tubes that supply an electric current to the model. nina switches on the current that provides an impulse to the heart. she observes that the heart contracts and relaxes. compare this model with that of a human heart, and place the steps describing how blood flows through the human heart in order.
  
• which of the following best describes the solar radiation absorbed by and radiated from earth? a. most incoming solar energy is absorbed by the atmosphere. b. only a small fraction of energy radiating from earth is from the atmosphere. c. the earth’s surface is responsible for a small fraction of heat radiation to space. d. earth’s surface absorbs little of the energy that strikes as solar radiation.
  
• the five components of health-related fitness include __________. a. cardiovascular fitness, muscle tone, muscular endurance, flexibility, and body composition b. cardiorespiratory fitness, muscular strength, resting heart rate, muscular endurance, and body composition c. cardiorespiratory fitness, muscular strength, muscular endurance, flexibility, and body composition d. calisthenics, muscular strength, muscular endurance, flexibility, and body composition please select the best answer from the choices provided. a b c d