Answer :
Final answer:
There are three commonly used body reference planes: sagittal, frontal, and transverse.
Explanation:
The question is not specifically related to biology, it is asking about the number of body reference planes in airplane orthographic reference planes. However, to answer the question, there are three commonly used body reference planes in biology: the sagittal plane, the frontal (coronal) plane, and the transverse plane. The sagittal plane divides the body into right and left portions, the frontal plane divides the body into front and back portions, and the transverse plane divides the body into upper and lower portions.
