metazoan

As the scientists conclude: "Our results expand the known metazoan bio-sphere and demonstrate that deep ecosystems are more complex than previously accepted..科学家总结道：“我们的研究结果扩展了已知的后生生物圈的范围，并揭示出，深层生态系统比我们之前想象的要复杂。

Since the Middle Proterozoic, metazoan trace fossils must have undergone an irreversible evolution from simple to complicated, and from lower to higher in quality..中元古代以来后生动物遗迹的演化过程在质上经历了由简单到复杂， 由低级到高级的发展、演变过程。