Mature human red blood cells
A. are biconcave discs without a nucleus.
B. have a nucleus.
C. fight pathogens.
D. carry plasma.
E. are rare in the bloodstream.
Answer: A
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A. Atomic structure B. Molecule dynamics C. Hierarchal organization of life D. None of these
Most microorganisms are pathogenic and harmful to the human body.
a. true b. false
Which blood constituent makes up most of the volume of blood?
A) White blood cells B) Red blood cells C) Blood proteins D) Plasma
Temperate grasslands and temperate deciduous forests are two different biomes that are located in the same latitudes. Which one of the following abiotic conditions is most likely to account for the differences in their community composition?
A. a rain shadow B. sunlight C. soil nutrients D. temperature E. precipitation