The embryo forms from the ________.
A) outer layer of the blastocyst.
B) placenta.
C) zona pellucida.
D) inner cell mass of the blastocyst.
E) morula.
D) inner cell mass of the blastocyst.
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Choose the answer that best describes HCO3-
A) a proton donor B) a weak acid C) a bicarbonate ion D) common in the liver
The pigment that is found in orange colored vegetables and accumulates inside keratinocytes is ________.
What will be an ideal response?
Contraction of the papillary muscles would
A. prevent the AV valves from protruding into the atria. B. open the semilunar valves. C. eject blood from the ventricles. D. close the semilunar valves. E. cause the atria to eject their contents into the ventricles.
Which forearm bone is on the lateral (thumb) side?
A. Radius B. Humerus C. Ulna D. Pisiform