A scientist wants to determine the best conditions for hatching Salmon fish eggs. In a laboratory, Salmon fish hatch at room temperature in glass containers of salt water. The concentration of salt in the water is known to affect how many Salmon eggs will hatch. What's the dependent variable and state how many containers to use in the experiment, and describe what would be added to each container in addition to the eggs. Which container(s) are in the Experimental Group and which container is the Control Group.