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.
This group includes all of the pouched animals, such as opossums, kangaroos, and Tasmanian devils.
difficulty
hard
toefl frequency
1
toefl classification