GRE Text Completion: JiJing 1373-GRE填空机经1373题 - N2452DC7XTO4UD78A

The researcher noted that microbes, although ____________, make up far more of the living protoplasm on Earth than all humans, animals and plants combined. A. invisible B. omnipresent C. diminutive D. ubiquitous E. minuscule F. ethereal