Final answer:
In many species, shared embryonic features and developmental processes are identical in their early stages of life. These shared features include germ tissue layers, mouth and anus development, and the presence of larval stages or molting. Embryological development provides evidence of relatedness among different species. Correct option is B.
Step-by-step explanation:
In many species, what is identical in their early stages of life is B) The presence of shared embryonic features and developmental processes.
During embryological development, animals go through similar stages and exhibit common traits. These shared features include the development of germ tissue layers, the formation of mouth and anus, and the presence of larval stages or molting. Embryological development provides evidence of relatedness among different species, as certain structures and traits are present in the early stages but may disappear in the adults.
For example, all vertebrate embryos, including humans, have gill slits at some point in their early development, but these disappear in terrestrial adults. Great ape embryos, including humans, have a tail structure during development that is lost by the time of birth. Similarities in embryonic development indicate evolutionary connections and inform the classification of species.