Questions: A lengthwise cut that separates the body into left and right portions is a plane. frontal transverse sagittal

The answer is the third one (sagittal): A lengthwise cut that separates the body into left and right portions is a sagittal plane.

Explanation for each option:

1. Frontal: This plane divides the body into anterior (front) and posterior (back) portions. It is also known as the coronal plane. Therefore, it is incorrect for separating the body into left and right portions.
2. Transverse: This plane divides the body into superior (upper) and inferior (lower) portions. It is also known as the horizontal plane. Therefore, it is incorrect for separating the body into left and right portions.
3. Sagittal: This plane divides the body into left and right portions. If the cut is exactly in the middle, it is called the midsagittal or median plane. If it is off-center, it is called a parasagittal plane. Therefore, this is the correct answer.

Summary: A lengthwise cut that separates the body into left and right portions is a sagittal plane.