In cladistics, a method for determining the evolutionary relationships among organisms that exist only as fossils. It is based on quantitative assessments of morphological (i.e. phenetic) similarities and geologic age (derived from stratigraphy).
科学参考收录了60776条科技类词条,基本涵盖了常见科技类参考文献及英语词汇的翻译,是科学学习和研究的有利工具。