这种差异的原因可能是不同体形的动物存在很多生理差异：生长发育的速度、新陈代谢和身体构造。
These differences arise due to a number of physiological differences, including rates of growth and development, metabolism and details of body composition.
树木的生长期受限于它的木质构造，后者决定树的硬度和形状。
A tree's rate of growth is limited by its lignin structure, which is what determines the tree's strength and form.
这可以由沉积在不平坦的表面所引起，如邻近和覆于礁体构造之上，或靠近一生长断层，或缘于对压实作用不同的敏感性。
This can result from location on an uneven surface, such as near and over a reef structure, or near a growth fault, or from different susceptibility to compaction.
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