What keeps the trachea from collapsing?
A) Cilia B) Surface tension of water
C) Surfactant D) Semicircular rings of cartilage
D
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Biosynthetic reactions that require energy for the conversion of molecular subunits into larger molecules are called
A. kinetic energy. B. catabolic reactions. C. precursor molecules. D. anabolic reactions.
You sit next to Uncle Ed, an immunologist, at Thanksgiving dinner. "I'm a 'big eater'", he says, "just like the cells I study." What are the large cells that engulf pathogens that Uncle Ed works with?
A. monocytes B. erythrocytes C. macrophages D. bacteriophages E. antibodies
Where is electricity made at a coal-fired power plant?
A- generator B- control room C- boiler D- colling tower F- silo
Describe the four stages of chemical and biological evolution.
What will be an ideal response?