Abody part lost its original function through evolution what is the vocabulary term

The body parts which are present in reduced form in the body and have lost their function in the body because of evolution are called vestigial organs.

Explanation:

The vestigial or rudimentary organs are the remnants of the structures or organs which might have been large and functional in the ancestors, or the organisms from which the present-day organisms have evolved. These vestigial organs are often undersized, degenerated and non-functional.

1.Examples of vestigial organs in humans ( Figure 1)

Vermiform Appendix- the human appendix is the remnant of the caecum which is large and functional in herbivorous mammals like cows and buffaloes. In these animals, it helps in digestion.Caudal vertebrae - Also known as coccyx or tail bone, the caudal vertebrae is prominent among our close relatives like monkeys, in which this forms a functional tail.

2. Examples of vestigial organs in other animals (Figure 2)

Hind-limbs in Python- The python has no use of limbs so these structures have been diminished in them and are present in only rudimentary form.

Cis your correct answer

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.