Which of these is the correct sequence of events leading to evolution

Most evolutionary occurrences happen when the specie evolves and adapts to have physical features that help them strive in their environment.
This theory contributes to the conservation of biology by helping the scientists to study and understand a population of species and on how they can react and change in their own environments. This will help the scientists to possibly save these species.

C. a mature ovule of a plant.

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