The bones in the front fins of whales and the bones in the human arm evolved from a common ancestor but carry out different functions. this is an example ofa. homologous structures. b. vestigial structures. c. embryonic structures. d. analogous structures.

Option A.

Explanation:

Analogous structures are similar structures that evolved independently in two living organisms to serve the same purpose.

Homologous structures are organs or skeletal elements of animals and organisms that, by virtue of their similarity, suggest their connection to a common ancestor. These structures do not have to look exactly the same, or have the same function

Vestigial structures no longer carry out any function.

la transducción de señal ocurre cuando una molécula de señalización de fluido extracelular activa un receptor de superficie de la célula.