It depends upon the species in question as to the length to which a worm can grow.
Specifically, all animals and plants have maximum and minimum sizes to which they may mature. The particular configuration is dependent upon the animal or plant in question. In terms of worms, the longest specimen on record turns out to be ribbon worm (Lineus Longissimus) whose length in death and after time spent in sea water is documented at 179.79 feet (54.8 meters).
Worm can very in size. They can be microscopic or grow to a littler over three feet in length. The most well known worm is an earthworm.
The slow worm (actually a legless lizard found in Europe and Asia) grows to about 50 cm (20") in length.
The size of a worm can vary significantly depending on the species. Common earthworms typically range from about 5 to 30 centimeters in length, while some species can grow even larger. For example, the giant Gippsland earthworm can reach lengths of over 3 meters. Therefore, without specifying a type, the length of a worm can vary widely.
There is no specific length of an inchworm.
Canker worm
The length of a long red worm typically found in the soil is around 4 to 8 inches.
rain
this question depends upon the size of the worm, if you want the area of the worm in mm or the surface area of the worm.
10 inches
2 feet
You would have to kill first for accuracy.
Based on the description provided, the worm might be a flatworm, such as a planarian. Planarians are known for their dark brown coloration, large triangular head, and flat body shape. They can grow up to 8 cm in length and usually have a diameter around 1 mm.