There are many reasons why it is necessary for induction to occur. One very important reason is transferring of heat.
No.
For electromagnetic induction, you need a conductor moving in a magnetic field.
Isolation Is necessary for speciation to occur.
Water, sunlight, carbon dioxide and chlorophyll are necessary for photosynthesis to occur.
Yup
It provides the energy necessary for the reaction to occur.
For evaporation to occur you need the following: Heat (energy), and water.
It is not "necessary" for oscillation to occur in any "arbitrary" circuit. It depends on the design objectives. Please be more specific, and restate the question.
A starter is unnecessary because the stator produces a rotating magnetic field.
a light source and a reflector
Estrogen
Internal heat.