That is why they are called Dasha (ten) Mahavidyas (Wisdom Goddesses- or Wisdom Shaktis). Basically each of these Shakti-s represent a profound and unique aspect of creation.
All of manifestation is only possible because of some Shakti (energy) and these ten- Shaktis are at the very core of everything in this manifested world.
Sadhana/Practice: Are you able to see the "old in the young" and the "young in the old"? What is young today will be old in time and what is now old, was once young! As you start to see the profound lesson in this statement, a new dimension of time will open up for you...