The cells that allow the immune system to respond more quickly to an antigen when it is encountered again later in life are called
A) innate immune cells.
B) helper T cells.
C) memory cells.
D) killer T cells.
C
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A house that absorbs and stores heat from the sun directly within a well-insulated, airtight structure is taking advantage of a(n) ____system.
A. active solar heating B. passive wind C. active biofuel D. passive solar heating E. passive geothermal
The two most abundant greenhouse gases in Earth’s atmosphere are ____________________ and ____________________
Fill in the blank with correct word.
Which habitat is the most impacted by pollutants?
A) Estuaries B) Intertidal zones C) Deep-water zones D) None of these choices
The world is becoming more democratic through
A) the replacement of monarchies with elected governments. B) increased participation from universal rights to vote and serve in government. C) the diffusion of democratic governance from democracies in Europe and North America. D) All of these are reasons the world is becoming more democratic. E) None of these are reasons the world is becoming more democratic.