No Earth isn't the biggest inner planet. Venus is. Even though it is hotter it is bigger than all of the other inner planets.
No, in fact many planets are hotter than it. the warmest is Venus and then Mercury.
The first four planets (Mercury, Venus, Earth, and Mars) are known as "Rocky planets" because they have a surface that you can stand on.
They have no moons. They are also the two planets with the hottest surface temperatures (Venus slightly hotter). In their orbits, the two are the only planets "inferior" to Earth (closer to the Sun).
No, there is no oxygen on any other planet other than Earth because there is no planet life on the other planets.
It isn't Mars is called "The Red Planet" because it is visibly redder than the other planets (due to the iron oxide on the surface)
"Terrestrial planet" essentially means that the planet in question is a rocky, earthen planet where one could (in a space suit) step onto its defined surface. ("Jovian planets" refers to the gas planet of Jupiter and all the other gas giants in the solar system.)
Microbes from Earth can be transferred to Mars or other planets on the surface to these planets but the overall risk is very low. Due to the harsh conditions of space, most microbes will suffocate or die from the extreme temperatures long before they reach another planet.
Well, Pluto isn't recognized as a planet, but as a dwarf planet. Also, there are other dwarf planets, but they are more like really big comets than they are planets.
life
No. The gravitational pull at the surface of a planet depends on that planet's mass and radius. Jupiter has the strongest gravity of any planet in the solar system: 2.53 times the surface gravity on Earth. Mercury has the weakest surface gravity at just 37% the gravity on Earth.
It is a dwarf planet. It is smaller than the other planets.