Lymphatic System

Lymphatic System

If pathogens get through the body’s first two lines of defense, a third line of defense takes over. This third line of defense involves the immune system. It is called an immune response, and is a specific type of response. The immune system has a special response for each type of pathogen.

CK-12 (Middle School)

ESSENTIAL QUESTION:

STANDARDS:
RST.2 - Main Ideas, RST.4 - Key Terms

DEPTH OF KNOWLEDGE (DOK) LEVELS:

2,1
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