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• the surfaces of the leaves of many plants help to reduce water loss because they are not water-permeable. how does the biomolecule that makes up this surface differ from other biomolecules?
  
• which verb form correctly completes this sentence? ellos _______ ir de viaje, pero tienen que trabajar.
  
• shown below is a chemical reaction. fe + cucl2 fecl2 + cu which pair of substances are the products? fe and cucl2 fe and fecl2 cucl2 and cu fecl2 and cu
  
• two countries are negotiating a trade agreement. what are unionized workers most likely to petition the government for?
  
• the president is the leader of the executive branch of the federal government. what is the analogous position in a state government?
  
• a population of wildflowers is separated by an eight-lane superhighway. pollen is often carried by the wind across the highway and can pollinate the flowers on the other side of the highway. can speciation occur in this situation? no, because the populations are not reproductively isolated. no, because the populations are not geographically isolated. yes, because the populations are reproductively isolated. yes, because the populations are geographically isolated.
  
• which excerpts from chapter 5 of wheels of change provide insight into changing social values of the time? check all that apply.
  
• an amount of nitrogen undergoes a physical change and increases its volume. what can be known about this physical change? the boiling point of the nitrogen increased. the mass of nitrogen increased. the color changed. the density changed.
  
• what are the goals of all terrorists groups, regardless of ideology? check all that apply. to participate in criminal acts to gain independence for a group to frighten people into submission to target symbolic places and events to achieve social and political changes to impose religion on nonreligious people to destroy governments and create anarchy
  
• suppose you want to design and build a house. how would you communicate your design plans with the construction crew that would work on the house?