Yes, these are considered organs. The skin and the bones both fall under the definition of an organ.
In ocean acidification, dissolving co2 gas increases the ph of the ocean
The dependent variable is the variable which can be manipulated and can affect the independent variable. The dependent variable is on the x-axis while the independent variable is placed on the y-axis. In this case, the x-axis is the number of weeks while the y-axis is the height of the plant.