Similar structures are present in the embryos of fish, salamanders, turtles, chickens and pigs. In fish, these structures develop into gills but in the other organisms they either disappear or develop into other body parts later in embryonic development.

Which of these statements below best explains the presence of these structures in the embryos of all five species?

A) The embryos of the five species are similar in size.
B) Breathing structures are similar among the young of the five species.
C) The five species have a common ancestor with these embryonic structures.
D) The reproductive mechanisms are similar among the adults of the three species.

These species have a common ancestor that reflects in their embryonic appearance. This would explain why they have similar features in this stage and how they develop in similar ways.

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lheduardomarques lheduardomarques · Answer 2 · 2022-02-04T13:11:26+01:00

Similar structures are present in the embryos. C) The five species have a common ancestor with these embryonic structures.

Homologous

When organisms of different species have organs that have the same embryonic origin and perform the same function or not, we say that the organs are homologous.

An example of a homologous organ is the fin of dolphins and the wings of bats. Despite having similar embryonic origin and skeletons with the same structural plan, the two structures have very different functions. While the fin aids in swimming, the wings aid in flight.

With this information, we can conclude that these individuals are homologous.

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