A group of water molecules are held together by
A. salt.
B. double covalent bonds.
C. polar covalent bonds.
D. ionic bonds.
E. hydrogen bonds.
E
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Which outer layer of the blastocyst forms part of the placenta?
A. Trophoblast B. Embryoblast C. Yolk sac D. Amnion E. Blastocoel
In the developing embryo, the midgut rotates 270 degrees around which of the following structures?
(A) superior mesenteric artery (B) celiac trunk (C) splenic artery (D) left renal artery (E) inferior vena cava
What is the distal portion of the male urethra that runs the length of the penis?
A) prostatic urethra B) membranous urethra C) spongy urethra D) intermediate urethra E) bulbourethra
Which statement about red bone marrow is false?
A. Red marrow is found in the cavity of long bones. B. Red marrow produces both red and white blood cells and platelets. C. Red marrow is composed of stem cells. D. Red marrow is found in the spaces of cancellous bone.