Whales and some other cetaceans have unusable leg bones as a vestigal structure.
vestigal
yes, they have 2 pairs, one is a vestigal structure, the other is used for sensory functions :)
vestigial structure-such as the human appendix, doesn't seem to have a function and may once have functioned in the body of an ancestor..:)
Vestigial StructureA vestigial structure is a structure that appears to no longer have a use in the body.
Vestigial structures are anatomical structures of organisms in a species which are considered to have lost much or all of their original function through evolution.
Sentence structure varies depending on the writers purpose.
The Imperative sentence is always use in putting a (.) in the last sentence
Stonehenge is an ancient structure.
I know that sentence this dot com offers the sentence structure worksheets for free this weekend. You should use it with your student to help her learn to write with little effort.
Sentence Structure
You can put a comma before or after just about any word if the sentence structure requires it. If the sentence structure does not require it, it may be permissable to use a comma to assist in clarity and avoid confusion. Otherwise, don't use a comma. Have I confused you yet? Using a comma does not depend on the word, it depends on the structure of the sentence.
A congenital heart defect is a problem with the structure of the heart.