Submitted by admin on Mon, 04/28/2014 - 11:12
definition:
A pocket-like abdominal receptacle in which marsupials carry their young during lactation.
sentence:
Two situations are considered, internal development of the embryos in closed incubating, brood or marsupial pouches, and external development in eggs exposed to the external medium.
This group includes all of the pouched animals, such as opossums, kangaroos, and Tasmanian devils.
difficulty:
hard
toefl frequency:
1
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