What is the most important reason to control the conditions of an experiment?
a) to make the experiment easier to repeat
b) to reduce the amount of data that must be recorded
c) because this is necessary for graphing the data
d because this is necessary for the data to be valid

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).