Which of the following is true for T cells?
A) T cells interact directly with antigens.
B) T cells are nonspecific, they recognize all antigens.
C) Each T cell is specific for a single antigen.
D) Each T cell can recognize a wide variety of antigens.
C
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A) the boreal forests of Siberia. B) the temperate forests of western North America. C) the rain forests in peripheral countries. D) the desert forests of the Middle East.
The _______________ of a rockfall is the distance it will travel
Fill in the blank with correct word.
The top farm product produced in the U.S. in terms of its value is beef
Indicate whether the statement is true or false
________ particulates in the atmosphere absorb water and are the basis for cloud formation
A) Gaseous B) Hygroscopic C) Poisonous D) Blue E) Carbon