iBT TOEFL Topic Vocabulary Breakthrough Unit 063

iBT TOEFL Topic Vocabulary Breakthrough Unit 063
Author: Li Xiaolai

63. For sheer variety and abundance, insects rank among the most successful animals on Earth. Dragonflies, unlike butterflies, do not create a chrysalis and undergo complete metamorphosis. Instead, they undergo a series of small transformations until they finally develop into the imago – the adult, winged form.

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