If you don't know yet...It will come to you...It's different for everyone...
Internal and external? 4real
A structure outside. A skeleton of an object.
skin
The external auditory meatus and the external acoustic meatus are two names for the same structure.
a tailbone
An Internal Structure is the way an organism looks on the outside and an External Structure is the looks on the outside.
External structure refers to the physical form or arrangement of something outside of its core components. This can include the shape, appearance, or design of an object, organism, or system. It often plays a role in the function or behavior of the entity.
No, it is not you can live your life just fine without knowing what it is.
Yes, but they have no external ear structure.
scientists classify organisms into groups based on internal and external features.
The external structure is the wing. Its bones are so not heavy that the wind takes the bird up and allows it to fly.
Like a cat.