According to the passage, an organisms without har...

A

- Hướng dẫn giải

Phương pháp giải:

Giải chi tiết:

Đáp án là A. Ý trong bài: Even hard parts left on the surface for any length of time will be destroyed, therefore, organisms must be buried rapidly to escape destruction by the elements and to be protected against agents of weathering and erosion.