Experimental researches in mice showed that ingested foreign DNA can persist in (fragmented) form in the gastrointestinal tract, penetrate the intestinal wall, and reach the nuclei of leukocytes, spleen and liver cells. What does the word in brackets mean?
A.Consisting of small pieces or parts. B.Each does things in his own way. C.Producing new life or offspring. D.Being discussed, described or dealt with.正确答案A
