What are the meanings of the terms topographic map, contour line, contour interval and index contour?

Topographic map:  They show the forms and features of land surfaces

Contour line: a line on a map connecting the points on a land surface that have the same elevation.

Countour interval:  the vertical distance between the elevations represented by adjacent contour lines on a map.

Index contour: Index contours are bold or thicker lines that appear at every fifth contour line.

Explanation:

the answer to your question is tooth decay.

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

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