The limitations of using fossil in evolution theory are that fossils are rare and only show changes in bones of animals. In many environments the preservation of fossils is hard creating gaps in fossil records that can make identifying change very hard. And when changes present themselves they can be in many forms, such as changing in the soft tissue, coverage and thickness of hair, and changes in organs, all of which can not be preserved by fossilization.
I’m not sure what kind of answer you need but I hope this is sufficient. Hope this helps. Stay healthy and stay safe! :)
Answer: The word X represents the organs which is no longer used by the species.
Explanation:
The word vestigial shows the characters that is not used by the species anymore. Example is appendix which is considered as a vestigial organ in human beings as it is no longer useful for the human body.
This organ was used when there was only vegetarian food available for the human beings to eat.
But now that animals and vegetable both are available there is no need for the enzyme required the digestion of cellulose.
So, this organ is vestigial for the human body.
These are both in charts, line graphs, tables, etc.
All the three elements belong to the same group in the periodic table, that is Group 15 (Va) of the periodic table. They are also known as Nitrogen group element, others are, antimony, bismuth and moscovium. They share certain general similarities in chemical behavior, which reflect common features of the electronic structures of their atoms.
Each element occupies the fifth position among the main group elements of its period, a position designated 15. Also they possess an outermost shell of five electrons. Additionally, they have an unshared, or lone pair of electrons which remains after the three covalent bonds, or their equivalent, have been formed.
