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Use the diagram to identify the four regions of the earthworm.
Dorsal side:
Ventral side:
Anterior end:
Posterior end:

See the Diagram as attached below-

Explanation:-

External Anatomy of the Earthworm is as mentioned below-

Dorsal Side- This side constitutes the top part of the Earthworm body. This part is darker than the remaining body part.

Ventral Side- The Earthworm’s bottom body part is the ventral side and this side is lighter in colour than the upper side.

Anterior side- The Head region is the anterior region of the Earthworm. It can be located by bump at its mouth.

Posterior side- The Tail constitutes the posterior region. Anus of the Earthworm forms the Posterior side.

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in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: