Question

The pelvis bone functions as an attachment point for legs. So, the pelvis bone found in dolphins is___(1)____ organ. I Options to 1: a.an analogous b. a homologous c. a vestigial.

Answer 1

The pelvis bone in dolphins is a vestigial organ, as it no longer serves its original purpose from their terrestrial ancestors. Unlike analogous or homologous structures, vestigial organs have lost their original function through evolution.

Step-by-step explanation:

The pelvis bone in dolphins, despite no longer being necessary for leg attachment, has remained part of their bodily structure. This is indicative of their ancestral relationship to land-dwelling creatures where a pelvis was needed for locomotion. As such, this now purposeless structure is referred to as a vestigial organ.

Vestigial organs are parts of an organism that have lost their original function through evolution. They are often compared with analogous and homologous structures. An analogous structure refers to those that have a similar function but were not present in the last common ancestor of those species, whereas homologous structures are found in different species because of common ancestry.

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