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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Which of the following is not a main glacial characteristic that any satisfactory theory of ice age causes must account for?
A) Concurrent development of pluvial conditions in dryland areas B) Multiple cycles of advance and retreat C) Eventual total deglaciation D) The simultaneous but non-uniform accumulation of ice masses in the Eastern and Western Hemispheres E) How snow transforms into glacial ice
Archaeocyathids were nektonic. Indicate whether the statement is true or false
Which of the following is NOT needed for plant growth?
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)