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Sophie [7]
3 years ago
13

The complement system is a ___ barrier of the immune system

Biology
2 answers:
m_a_m_a [10]3 years ago
8 0
Biochemical- apart of the second defense system
schepotkina [342]3 years ago
6 0

Answer:

biological

Explanation:

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The independent variable is the variable that you change. For example, if we were growing plants and wanted to see if more sun made them grow higher, you would change the amount of sun that each plant is exposed to.

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