Final answer:
Pluto has the most unusual behavior among the listed planets based on its orbit, with a highly eccentric and inclined path, and even crossing Neptune's orbit at times. It's also a dwarf planet, setting it further apart from Mercury, Venus, Mars, and Uranus.
Step-by-step explanation:
Based on its orbit, Pluto behaves the least like the other planets mentioned (Uranus, Venus, Mercury, Mars). Pluto has a highly eccentric and inclined orbit, which is unusual compared to the more circular and less inclined orbits of the planets in the Solar System. Its orbit sometimes brings it closer to the Sun than Neptune, making it a unique case. It is also important to note that Pluto has been reclassified as a dwarf planet due to its size and the characteristics of its orbit, which further distinguishes it from the terrestrial planets like Mercury, Venus, and Mars.
Mercury, on the other hand, has the shortest period of revolution around the Sun, taking only 88 Earth days to complete one orbit. Mercury's orbit is also eccentric, but not to the extent of Pluto's, and it remains close to the Sun, making it difficult to observe from Earth. Mercury's small mass, high density, and lack of significant atmosphere also set it apart from the other planets, particularly the Earth-like Venus and Mars. However, when considering the behavior of orbits, Pluto's distinction is the most pronounced.