In animal evolution, an alteration in the ontogeny of a descendant such that some developmental process commences later than it did in its ancestor, and may not have been completed by the time the animal reaches maturity.
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。