If the sequence is undisturbed which rock layer is the oldest? which is the youngest? explain your answer

Looking at a basic timeline on wikipedia, I think the oyster fossils because invertebrates evolved before vertebrates and fish came before land plants. Although ferns are relatively early landplants, they are not the first land plants. Therefore, based on wikipedia, the oyster fossils.

However, limestone is a little curious because limestone usually results from shells of ancient animals. I don't know if that's a red herring,

Mitochondria is the cell organelle that produced the energy that is needed in the body system in form of atp, that is why it is called the power house of the cell. energy is needed by the living organisms to carry out the activities which sustain life.  if the mitochondria is destroyed atp will not be produced. if the mitochondria is destroyed, energy production will stop and the affected living organism will not have the energy to carry out the necessary life processes; this will lead to the death of the organism.