A scientist is raising the temperature of a sample of water to find out if the amount of salt that can be mixed into the water changes. Which the independent variable in this investigation?
b
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the amount of water in the sample
the temperature of water
the amount of salt that mixes in the water
the type of salt mixed into the water

What is one affect on the australian environment due to the introduction of non-native european rabbits? (a) more grass grew in response to the need of the growing population of rabbits. (b) the rabbits balance out the food chain as they became a natural prey to many predators. (c) the rabbits the land by digging, which caused the soil to spread much needed nutrients. (d) the rabbits out-competed other small animals species and caused them to go extinct.