From which group of dinosaurs did birds arise?
A. theropods
B. cynodonts
C. pachycephalosaurs (bone-heads)
D. lepidosaurs
E. ichthyosaurs
Ans: A. theropods
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Which event occurs in the lungs?
a. Free H+ binds to hemoglobin. b. Plasma HCO3? enters erythrocytes.
c. CO2 and H2O are converted into HCO3? and H+ in the plasma. d. Carbonic anhydrase converts CO2 and H2O into HCO3? and H+ in erythrocytes. e. CO2 binds to hemoglobin.
Cells in the juxtaglomerular apparatus secrete ____ in response to a significant drop in blood pressure or blood
volume.
a. atrial natriuretic factor b. renin c. aldosterone d. antidiuretic hormone e. angiotensin
The impact of natural selection is demonstrated by
a. directional selection. b. stabilizing selection. c. neutral selection. d. disruptive selection. e. directional selection, stabilizing selection, and disruptive selection.
Chlamydomonas nivalis (alga)
What will be an ideal response?