Answer:
A) Year
B) Number of Wolves
C) Bar graph
D) Year
Step-by-step explanation:
A) The year is always definite; it never depends on any other variable. The number of wolves doesn't change the year.
B) The number of wolves depends on variables like food, water, shelter, ect. The number of wolves isn't magical and just change on its own.
C) I think a bar graph will work best best it shows a more visual representation of the number of wolves. A line graph can be confusing with how proportional and scattered the data is, and a scatterplot diagram would be better if you were tracking the number of wolves and another variable, like available food or something like that. With the given data, to me, a bar graph makes the most sense.
D) The independent variable tends to always be what x stands for, and the dependent variable always tends to be what the y stands for. Since the year is our independent variable, and our x is the year, we can name the x axis "Year." Its simple, but it works.
I hope this helps!