In the hierarchy of biological organization, an organ is composed of several interacting and working together.

tissues

Explanation:

Tissues(made of cells with specific functions)make organs

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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c. the initial amount of money placed in the savings account