Their mass because it can let you know their weight and size
The primary source of stem thickening in plants is the vascular cambium. It is a plant tissue located between the phloem and the xylem and in the root of a vascular plant. It is the source of secondary growth or the radial growth of the stem of a plant.
The cerebrum is a large part of the brain containing the cerebral cortex it lies either in front or on top of the brainstem
I'd have to go with the first option, stags have more prominent antlers than does
