2. Falling sea levels and colliding continents created connections between continents that led to great movements of land animals during the Neogene Period is the correct statement.
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Adaptation because organisms adapt to avoid extinction.
The answer is constellations.
The solar system is considered a natural system because it was made and controlled by natural forces, meaning, it was never influenced with human creations. It is considered as one of the products of the phenomenon of the physical world. Hope this answer helps you.