Answer:
How many patients had allergies or ear infections, but not both?
24
27
36
40 answer
Explanation:
This would be called--Visual.
Hope this helps please hit the thank you button.
Remember that a controlled variable is a variable that stays the same thoughout the experiment.
it wouldn't be a. because two different wires were used
the final length of the wax would be your dependent variable, so it wouldn't be c.
the thermal conductivity is the independent variable so it isn't d.
the original length of the wax was the same for both.
So B is your answer.
The answer is
Carbon because your dealing with coal
