iBT TOEFL Topic Vocabulary Breakthrough Unit 069

iBT TOEFL Topic Vocabulary Breakthrough Unit 069
Author: Li Xiaolai

69. The primitive bees, like their relatives the wasps, are solitary. Each female makes her own burrow, in which she constructs earthen chambers to contain her young. Some bees are communal. They are like solitary bees except that several females of the same generation use the same nest, each making her own cells for housing her eggs, larvae, and pupae.

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