The fluid-filled structure that helps to cushion and protect a developing embryo is the
A. zona pellucida.
B. blastocyst.
C. placenta.
D. amnion.
Answer: D
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a. water b. air c. humus d. mineral matter e. All of these are needed.
Bituminous coal is the highest "grade" or "rank" of coal.
Answer the following statement true (T) or false (F)
Which of the following is not a main glacial characteristic that any satisfactory theory of ice age causes must account for?
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