The word “they” in line 22 refers to A. rocks B. shores C. oceans D. specimens
Giải thích
Lời giải:
Đáp án: D
7. Thông tin: In manyinstances the specimens are less than one-tenth of a millimeter in diameter.Althoughthey were entombed in the rocks for hundreds of millions of years, many of the fossilsconsist of the organic remains of the organism.