The bacteria on the margin are the most active and healthiest because they have access to fresh nutrients and have not yet contaminated the culture medium with waste.
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4 units The radius of a circle is the distance from the center to the edge. The diameter of a circle is the distance from the edge, going through the center, to the opposite edge.
Radius is from the center of a circle to the outer edge. Diameter is from the outer edge to the opposite outer edge, i.e., through the center. The diameter has twice the length of the radius.
radius
The radius
radius