1. Because its structure is more complex, A. a tissue has a more complex function
than an organ.
B. a cell has a more complex function than
a tissue.
C. an organ has a more complex function
than a tissue.
D. a cell has a more complex function than
an organ.

Organs are more complex units than tissues. An organ is an organization of several different kinds of tissues so arranged that together they can perform a special function. For example, the stomach is an organization of muscle, connective, epithelial, and nervous tissues.

Explanation:

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