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• why are bacteria a necessary part of the nitrogen cycle? other living things cannot use atmospheric nitrogen. other living things cannot use the nitrogen in plants. bacteria are the main nitrogen reservoir. bacteria are the main nitrogen transpirators.
  
• which element is the basis for all living things and can combine with other elements in many ways? phosphorus carbon oxygen sulfur
  
• doubling which quantity would cause the largest increase in a spring’s elastic potential energy? displacement spring constant mass gravitational acceleration
  
• after attempting the warm-up exercises suggested by the author, describe how they made you feel. do you feel more relaxed or loose? do you find it easier to move, or to speak clearly? (site 1)
  
• if p is the hypothesis of a conditional statement and q is the conclusion, which is represented by ? the original conditional statement the inverse of the original conditional statement the converse of the original conditional statement the contrapositive of the original conditional statement
  
• which of the following statements best describes the effects of the civil war in sudan? a. somalia conquered sudan. b. sudan was split into three separate states. c. sudan was unified into a single islamic republic. d. sudanese refugees fled to neighboring countries. please select the best answer from the choices provided. a b c d
  
• david drove 232 miles in 4 hours and 319 miles in 5.5 hours. what is the constant rate of change?
  
• what is the probability that both of eduardo’s partners for the group project will not be boys? startfraction 9 over 65 endfraction startfraction 24 over 65 endfraction startfraction 64 over 169 endfraction startfraction 128 over 325 endfraction
  
• define the principle you have selected and explain how it supports ideas in the preamble.
  
• the area, a, of an ellipse can be determined using the formula a = πxy, where x and y are half the lengths of the largest and smallest diameters of the ellipse. which is an equivalent equation solved for y?y = a · πxy = a + (πx)y = a – πxy = a ÷ (πx)