Homologous These species did not evolve from a common

Homologous structures are anatomical signs of
evolution that derived from a similar lineage. It displays a similar base
structure, but have completely different functions. Mammals are their extinct
relatives contain an indentation in the skull behind each eye socket called the
synapsid opening. Living mammals have inherited the same opening, except it’s
larger. As larger openings evolved, jaw muscles and chewing motions came to be.

There is a muscle for chewing that extends from the lower jaw to up to the
opening evolved. This might have led to better chewing and digestion. Also,
three middle ear bones were an advanced feature. The two additional ear bones
helped form a joint between the upper and lower jaws. As time progressed, the
ear bones decreased in size and moved towards the lower jaws, forming a new
joint. “Other advanced features of mammals include having hair and producing
milk for their young. Unfortunately, features like these leave no trace in most
fossils. (American
Museum of Natural History, n.d.).” Analogous structures are opposite of Homologous
Structures, they are convergent features of different species that have
structures that preform the same task, but are not alike in structure. These
species did not evolve from a common ancestor, they just evolved in response to
a similar environment. 

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