Strep throat may progress to ________, characterized by a skin rash and a bright red swollen tongue
A) pyoderma
B) toxic shock syndrome
C) scarlet fever
D) rheumatic fever
E) scalded skin syndrome
C
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The interlocking rib cage of Tiktaalik roseae suggests that this transitional organism had lungs. What other traits were found in T. roseae, but not in its ancestral form?
A. An upright stance. B. Wings and scales. C. Primitive wrist and finger-like bones. D. Live young and fins. E. Articulating hip bones.
During the first major divergence of life the
atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from anaerobic to aerobic. d. firmly in the age of aerobes. e. all of these.
Respond to statements 131–135 in reference to the four structures
of the heart listed below. a. right atrium b. left atrium c. left ventricle d. right ventricle M 131. Blood from the superior and inferior vena cava enters the heart via this structure. M 132. Blood passes to the lungs from this structure. M 133. Deoxygenated blood exits the heart from this structure. M 134. Oxygenated blood enters the heart via this structure. M 135. Blood is pumped to the majority of the body by this structure.
Sponges, cnidarians, and flatworms lack a specialized gas exchange surface because
A) they are too large for a circulatory system to operate well. B) they live without need for oxygen. C) they do not produce carbon dioxide. D) countercurrent exchange mechanisms cannot function well in their living conditions. E) nearly all of their cells are in direct contact with the external environment.