Which body system dose the immune system rely on to provide the first line of defense against pathogenes?
a) integumentary system
b) nervous system
c) circulitory system
d) endocrine system

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explanation:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.