Chemists working for a pharmaceutical company carry out an experiment in which they measure the amount of time it takes for different amounts of an antacid to neutralize 1 mL of hydrochloric acid. The results of their experiment are shown in the graph to the right. a. What are the independent and dependent variables in this experiment?

b. What does the graph show you about the relationship between the amount of antacid and the length of time to neutralize the acid?

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Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.