TOEFL Listening: TPO-TOEFL阅读TPO - J1N95IH0070PNHAZN$

Directions: Select from the seven sentences below the two sentences that are true of punctuated equilibrium and the three sentences that are true of gradualism Drag each sentence you select into the appropriate column of the table. Two of the sentences will NOT be used. This question is worth 3 points. A. States that new species emerge from existing species during relatively brief period of time B. Was first formulated by Charles Darwin C. Explain why North American horses have become smaller over time D. States that new species evolve slowly and continuously from existing species E. Explain the lack of intermediate fossil forms in the fossil record of many species F. States that a species will not change unless its environmental changes G. Is associated with periods of environmental stability