Antibodies
A. are made by innate immune cells.
B. are molecules or parts of molecules belonging to foreign pathogens.
C. are Y-shaped proteins with two pathogen-binding sites.
D. bind to a wide variety of different antigens.
Answer: C
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The vadose zone differs from the groundwater zone in what way?
A) The Earth materials in the two zones are different. B) The vadose zone is unsaturated, while the groundwater zone is saturated. C) The vadose zone lies below the groundwater zone. D) The vadose zone contains no water, while the groundwater zone does contain water.
A dynamic system refers to a system in which
A. matter, energy, or both, are constantly changing their position, amounts, or form. B. the first law of thermodynamics does not apply. C. water molecules are constantly increasing in speed over time. D. motion causes the matter within the system to contain less energy than it would have contained when sitting still.
There is essentially no difference between soil texture and soil structure.
Answer the following statement true (T) or false (F)
Charging a higher proportion of real costs rather than subsidies has led to water conservation.
Answer the following statement true (T) or false (F)