A nucleus because it is a commonly used outed covered structure.
The outer covering of the grain is called Husk.
Tonoplast is the outer covering of vacuole
The outer covering of an apple is called the skin or peel.
The outer covering of the grain is called Husk.
The outer covering of an egg is called the shell.
Tonoplast is the outer covering of vacuole
The outer covering of an insect is called the exoskeleton.
Exoskeleton
It' a fungi called KERATIN. Visually, it is the bumpy stuff on the outer covering of a tadpole.
They have shells to protect them from their enemies.
A shell. Before that the chicken was covering it.
they have same outer covering