The figure below shows snapshots of a planet along its orbit around a star.This planet is experiencing changes in its: 
Definitions:
Human Eye
The organ of vision in humans, containing structures such as the retina, pupil, and lens, allowing for the perception of light and color.
Evolution
The change in heritable characteristics of biological populations over successive generations.
Human Immune System
The complex network of cells, tissues, and organs in humans that works together to defend against pathogens, infections, and diseases.
Smallpox
A contagious and often fatal infectious disease caused by the variola virus, characterized by fever and a distinctive progressive skin rash.
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