Xylem and phloem
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The answer is D, Because dinosaurs appears in the Triassic period while insects appeared in the Devonian period which is about 160 million years about, which rules out A and B. Humans have been on Earth for almost 3 million years, which is nothing compared to the history of life in earth, which about 4,000 million years of life history, so D
C is your answer :)
And also C and D are true but its C.
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D.) 70% mammals are 70 percent water