Question

in order to better understand similarities and differences among biological organisms, scientists developed a system of classification.
initially, the system only consisted of two kingdoms - animalia and vegetabilia. now, there are six kingdoms - eubacteria, archaebacteria, protista, fungi, plantae, and animalia.
this demonstrates that
○a. the classification of organisms is a fixed process.
○b. the classification system is no longer subject to change
○c. systems of classification are adaptable
○d. early scientists were not proficient researchers.

Explanation:

• 最初分类系统只有两个界（动物界和植物界），现在有六个界（真细菌界、古细菌界、原生生物界、真菌界、植物界和动物界），说明分类系统是可以变化的，是可适应的。
• A选项说生物分类是固定过程，与原文不符，原文体现了分类的变化。
• B选项说分类系统不再变化，也不符合原文，因为从两个界变为六个界说明有变化。
• D选项说早期科学家不是熟练的研究者，原文未提及相关内容。

Answer:

C. systems of classification are adaptable