Final answer:
The correct classification of the plane that divides an animal into equal right and left portions is the midsagittal plane, which is fundamental for anatomical studies and clear communication.
Step-by-step explanation:
The student asked about the classification of the plane that divides an animal into equal right and left portions. This is a concept in biology related to anatomical directions and planes. The correct answer to the question is b. midsagittal, a plane that cuts the body into equal left and right halves. Making these distinctions is important for anatomical studies as it ensures consistent and clear communication regarding the location of structures within the body.