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• iron, an element with the chemical symbol fe, is an important element. it is used to make steel and is part of the substance that transports oxygen throughout the human body.
  
• a is scientific knowledge established through direct observation and remains constant. scientific knowledge can change when scientists .
  
• soil ph is a measure of the acid content of the soil. the graph shows the tolerance of earthworms to soil ph. the graph is titled tolerance. it plots population on the vertical axis against a range of environmental variable on the horizontal axis. the shape of the curve is like a bell, and extends from the lower limit of tolerance to the upper limit. in a meadow where earthworms live in the soil, the ph gradually decreases from the optimum range into the zone of stress. what is the most likely effect on the earthworm population? a. the size of the earthworm population increases, but otherwise the population is unchanged. b. the size of the earthworm population decreases, but otherwise the population is unchanged. c. earthworms that tolerate high ph become more common in the population. d. earthworms that tolerate low ph become more common in the population.
  
• which statement helps explain the symbolism of piggy's glasses in lord of the flies?
  
• freshwater can be renewed, but environmentalists consider it nonrenewable. why is there a contradiction in classification?
  
• a local arts council has 200 members. the council president wanted to estimate the percent of its members who have had experience in writing grants. the president randomly selected 30 members and surveyed the selected members on their grant-writing experience. of the 30 selected members, 12 indicated that they did have the experience. have the conditions for inference with a one-sample
  
• how does the graph of y = startroot x endroot + 2 compare to the graph of the parent square root function? the graph is a horizontal shift of the parent function 2 units right. the graph is a horizontal shift of the parent function 2 units left. the graph is a vertical shift of the parent function 2 units up. the graph is a vertical shift of the parent function 2 units down.
  
• which command form best completes this sentence? guillermo: usted es un excelente cocinero. ¡_______ la torta de chocolate, por favor!
  
• what are the two largest parts of the wealthy man’s prescription? what are the two smallest parts?
  
• which sample fairly represents the population? select two options. measuring the height of every fiftieth person on the school roster to determine the average height of the boys in the school calling every third person on the soccer team’s roster to determine how many of the team members have completed their fundraising assignment observing every person walking down main street at 5 p.m. one evening to determine the percentage of people who wear glasses sending a confidential e-mail survey to every one-hundredth parent in the school district to determine the overall satisfaction of the residents of the town taking a poll in the lunch room (where all students currently have to eat lunch) to determine the number of students who want to be able to leave campus during lunch