Question

How much is the lifespan of an earthworm?
A. $1 - 3$ years
B. $2 - 8$ years
C. $3.5 - 10.5$ years
D. $6 - 8$ years

Answer 1

The earthworm is the terrestrial invertebrate belonging to the annelid phylum. These are often known as a segmented worm. Their body is a tube body plan with external segmentation usually having setae in all segments. There are more than $2500$ species of earthworm all over the world. The life span of the earthworm depends on the species

Complete answer:
Earthworms are the largest member of Oligochaeta subclass in the order of opisthosoma.
It is commonly found in soil, eating a wide variety of organic matter.
Earthworms are usually $3 - 4\,inches$ in length. At birth, it emerges small but fully formed only lacking the sex organ which develops within $60 - 90$ days.
Earthworm lifespan is species dependent.
The average lifespan of earthworms under growing conditions is usually $3$ ∙$5$ to $10$ ∙$5$ years. Most garden varieties live for $1 - 2$ years.
So, the correct answer is “Option C”.

Additional Information:
Earthworms have ring-like segments along their body called annuli.
It respires through its skin. The alimentary canal runs throughout the body. It has a central and peripheral nervous system. It has a closed circulatory system.
As it is an invertebrate, it lacks a true skeleton. Circumferential and longitudinal muscles of earthworm help in the locomotory action.
Earthworms are hermaphrodites, each carries male and female sex organs. The excretory system contains a pair of nephridia in every segment.
There are $3$ types of nephridia: integumentary, septal and pharyngeal.

Note:
Earthworms are terrestrial invertebrates belonging to the annelid family. It grows into $3 - 4\,inches$ in length. There are more than species in the world. The life span of an earthworm is species-dependent. Moreover, most of the earthworm species live for $3$ ∙$5$ to $10$ ∙$5$ years under favourable growing conditions.