Depends on the context, it could be one of the followings, and not limited to:
Nested
Encapsulation
Hiding
Isolation
Wrapped
Adapted
Composing
Embedded
Consisted of
nested
A folder contained within another folder is called a subfolder. it can also be referred to as a parent and child folder.
A Subfolder. Folder-ception
When one trait is not completely dominate over another, this is called incomplete dominance. What will be seen (phenotype) will be a blending of the two.
By saying nucleus, we mean that the DNA is contained in a membrane structure, that we call the nuclear membrane. However in prokaryotes (bacteria are examples!) the nucleus is not contained in a membrane structure. On the contrary, the DNA is rather suspended inside the cytoplasm itself in a compact form and is called a nucleoid.
inner ear
One of its factors
It it called balanced forces.
This is called codominance.
unbalanced forces.
multiple
I believe this sort of structure is called a vestigial structure (a left over remnant). The appendix is another vestigial organ.