Which of the following is an isolated diene? 
Definitions:
Chromosomes
Chromosomes are long strands of DNA wound around proteins, found in the nucleus of cells, containing genes that code for traits.
Foramen Ovale
An opening in the fetal heart connecting the right atrium to the left atrium, allowing blood to bypass the lungs, which are not yet in use.
Fossa Ovalis
An oval depression in the interatrial septum of the heart that is a remnant of the foramen ovale of fetal circulation.
Congenital Disorder
A medical condition or defect that is present from birth, which can be caused by genetic abnormalities, infections, or environmental factors affecting fetal development.
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