Pharyngeal slits are present in the embryo stage of fish, amphibians, reptiles, birds, and mammals. These homo-logous structures are present in the embryos of evolutionarily related organisms.
Homologous structures are similar phenotypic traits in organisms that share a common ancestor, these features may or not have the same function.
Conversely, analogous structures are phenotypic traits that have the same function in unrelated organisms.
A well-known example of homo-logous structures is the limbs of cats, humans and dolphins.
Embryonic homologies are homo-logous structures observed prior to adulthood, which can be used as pieces of evidence that indicate a common evolutionary origin.
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