Vestigial structures. These are structural elements that once served a purpose but as the organism evolved now serves no purpose.
Organs combine to form C. an organ system
hope this helps
As the experts says, solar eclipse do not happen always like lunar
eclipses do that is visible for a long periods of time and are observable. Unlike
solar eclipse, it happens hundreds and thousands of years to see it. Few people
can only see solar eclipse, and those only those people
who are in the small region where the Moon's umbra strike's Earth can witness
one.
