If those parts of us that you all say they might not do anything it doesnt mean that if we didnt found a useful job for them they just exist for nothing in our body. Some things ar just beyond our imagination.

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Steroids

these useless body parts through evolution will eventually disappear

Quite interesting information! I've found more useless body-parts.. Here they are:
VOMERONASAL ORGAN
A tiny pit on each side of the septum is lined with nonfunctioning chemoreceptors. They may be all that remains of a once extensive pheromone-detecting ability.
MALE UTERUS
A remnant of an undeveloped female reproductive organ hangs off the male prostate gland.
FEMALE VAS DEFERENS
What might become sperm ducts in males become the epoophoron in females, a cluster of useless dead-end tubules near the ovaries.