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Match the chemical, cell, or tissue with the function it performs in the immune response.
-physical barriers lining the respiratory and digestive system that prevent the invasion of pathogens
Q4: Which structure increases the speed of impulse
Q4: Which of the following sequences correctly describes
Q18: Discover, a popular magazine about science<br>A)primary<br>B)secondary
Q21: Bending your elbow involves<br>A)smooth muscle contraction.<br>B)the use
Q25: The arrow is pointing to a pH
Q27: Which step in the scientific method is
Q27: Other than the polar tundra, the LEAST
Q30: Predation increases are responsible for density-_ changes
Q38: Which of the following would be abiotic
Q54: The photograph shown depicts two brightly colored