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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. which statement about fe is supported by the modern atomic theory but not john dalton’s theory? the element iron is composed of small particles called atoms. the electrons of iron have probable locations in a region of space around the nucleus. iron atoms combine with other atoms in whole number ratios to form compounds. chemical reactions that involve iron do not create new atoms of iron.
  
• who administers the clean air act? a. local police forces b. the environmental protection agency c. the office of homeland security d. individual businesses please select the best answer from the choices provided a b c d
  
• which technology is used to service space vehicles and other equipment? space probe space station space satellite space observatory
  
• whose explorations led to a greater knowledge of north america, the arctic, australia, and the hawaiian islands? robert de la salle’s and henry hudson’s henry hudson’s and james cook’s samuel de champlain’s and robert de la salle’s james cook’s and samuel de champlain’s
  
• what factor determines what the star will become after the main-sequence stage
  
• which method of measuring weight involves comparing a person's weight and height?
  
• select the correct answer. which of the following is a medicine that stimulates the body's immune response to make disease-fighting molecules to attack a specific pathogen? a. analgesic b. antibiotic c. antitoxin
  
• the papuan kingfishers living in the mainland of new guinea show little variation in bill size, tail feather length, and structure. the isolated population of papuan kingfishers living on nearby islands differ from each other and from the mainland kingfishers. which statement would be the most direct reason that island kingfishers have greater variation as compared to the mainland kingfishers? responses it is a result of migration from one island to another. it is a result of migration from one island to another. it is a result of adaptation to food and climate of the island. it is a result of adaptation to food and climate of the island. it is a result of frequent climatic changes experienced on the island. it is a result of frequent climatic changes experienced on the island. it is a result of competition between the island and mainland kingfishers.
  
• which of these points matches one of wilson’s proposals to avoid future wars? adding barriers to trade encouraging nations to arm themselves declaring freedom of the seas allowing secret treaties
  
• if a data set has only one outlier, which value will always change when the outlier is excluded? the median the range the interquartile range the upper quartile