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• population data was not tracked until the 20th century, though experts believe waterfowl populations were up to times larger than current populations.
  
• triangle a b c is shown. angle a b c is a right angle. an altitude is drawn from point b to point d on side a c to form a right angle. the length of a d is x, the length of d c is 4 x, and the length of b d is 10. what is the value of x? 2 units 3 units 5 units 8 units
  
• which of these are credible sources? check all that apply. personal blogs sites with anonymous authors university or educational sites government sites museum websites
  
• which practice poses the greatest safety concern? talking to others in the lab accumulating clutter on the lab bench performing an experiment when sitting down reading the temperature of a water bath
  
• how many points of intersection are there between line a and line b if they contain the points listed? line a: (–4, 9) and (0, –3) line b: (4, –9) and (0, 3) zero one two infinite
  
• when using nitrogen in repairing a sealed refrigeration system, what should the nitrogen tank always be equipped with?
  
• what are some options available in the spelling and grammar checker? check all that apply.
  
• read the passage. then, answer the questions about the underlined text. what kind of figurative language is the underlined text? what is the meaning of the underlined text?
  
• john and pat are identical twins with identical dna. john works in a movie theater, and pat works as a lifeguard. they have very different skin pigmentation. which is the best explanation of the difference? skin color, a polygenic trait, is also determined by environmental factors. skin color, a polygenic trait, is also determined by the sex of the individual. skin color, a trait that demonstrates incomplete dominance, is also determined by environmental factors. skin color, a trait that demonstrates incomplete dominance, is also determined by the sex of the individual.
  
• how did henry ford affect the automobile industry? he made car production cheaper by improving the assembly line. he made car production more expensive by making more luxury cars. he made car production more expensive by mass-producing vehicles. he made car production cheaper by using customized parts.