The answer to this question is D. Cells
A line graph so you can see the decrease or increase of size in tortoise shells
I would say you can tell when someone is out of breath and coughing hard. More than normal. If someone were to jog a lap then come back wheezing and coughing, that could mean they have asthma.
The biceps and triceps act against one another to bend and straighten the elbow joint