Because of the tilt of the Earth's north-to-south axis, seasonality exists and regular, annual fluctuations in temperature and precipitation exist.
The Earth's 23.5-degree tilt on its axis causes seasonal variation in solar intake. Earth's orientation to the sun shifts as it orbits the sun. Because of the tilt of the axis, not all of the earth receives the sun's radiation at the same intensity, resulting in the difference.
Seasonality means the cyclical fluctuations in temperature and/or rainfall over the course of the year, which in turn impact both the composition and the dynamics of ecosystems. According to scientists, an Earth without a tilt would have "climate bands" that would become steadily colder the further you were from the equator.
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