The Recapitulation Theory And Human Infancy
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9. ' In other groups the life-history is not direct but circui- tous, and presents forms which require an explanation other than that of adaptation to the environmental conditions of the adult. These forms often have some kind of ancestral refer- ence, and have been retained probably because of some utility either to the larvae in their independent struggle for existence, or as structural bases for higher differentiations in case they are found in embryos. Some are rudiments without utility of ...any discernible sort.
10. In the majority of cases the ancestral reference of embry- onic or larval stages is to embryonic and larval stages of ances- tors. These may have originated either as larval or embryonic conditions as such, or as adult structures which have been re- tained in some fashion in the earlier ontogeny of descendants.
11. In the smaller number of cases where the ancestral refer- ence of early ontogenetic stages is conclusively to adult forms the explanation is as follows : A life-history originally direct may have been modified at a not early age and thus left the earlier part to resemble the adult ancestor.
What to read after The Recapitulation Theory And Human Infancy?
You can find similar books in the "Read Also" column, or choose other free books by Percy E Percy Erwin Davidson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
9. ' In other groups the life-history is not direct but circui- tous, and presents forms which require an explanation other than that of adaptation to the environmental conditions of the adult. These forms often have some kind of ancestral refer- ence, and have been retained probably because of some utility either to the larvae in their independent struggle for existence, or as structural bases for higher differentiations in case they are found in embryos. Some are rudiments without utility of ...any discernible sort.
10. In the majority of cases the ancestral reference of embry- onic or larval stages is to embryonic and larval stages of ances- tors. These may have originated either as larval or embryonic conditions as such, or as adult structures which have been re- tained in some fashion in the earlier ontogeny of descendants.
11. In the smaller number of cases where the ancestral refer- ence of early ontogenetic stages is conclusively to adult forms the explanation is as follows : A life-history originally direct may have been modified at a not early age and thus left the earlier part to resemble the adult ancestor.
What to read after The Recapitulation Theory And Human Infancy?
You can find similar books in the "Read Also" column, or choose other free books by Percy E Percy Erwin Davidson to read onlineMoreLess
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