Can someone please please help

The evolution of a species is caused by natural selection not genetic variation.

If a brown frog is more camouflaged than a purple frog, the purple frog will be more easily spotted by predators and will die out. Eventually there will be no more purple frogs to reproduce so all frogs will become brown. This is adaptation of a species in order to survive.

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.

Pancreassalivary glandsliverlachrymal glandssweat glandoil glandsgoblet cells