Considering that you shouldn't go outside during a tornado, yes. You are much safer inside.
Air density inside a tornado is about 5-10% less than that of the air surrounding it.
That is not known. Not enough measurements have been taken from inside a tornado.
The only cloud you will actually find inside a tornado is the condensation funnel. Other clouds, such as the wall cloud and cumulonimbus are outside the tornado itself.
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No. Trying to get a piacture from inside a tornado would be very dangerous and not worth the risk,
Yes, the eye of a tornado typically contains air from the surrounding environment, which includes oxygen. The winds inside the tornado can be less turbulent in the eye, allowing for the presence of oxygen in that part of the storm.
The air pressure inside a tornado is very low.
No. It is the spinning air that forms a tornado.
A tornado is itself a kind of vortex, and can have smaller vortices inside of it.
The air pressure in a tornado is lower than that outside the tornado. That is why the wind blows toward the funnel.
The air inside a tornado is cooler than its surroundings. This is not due to the wind or the fact that it comes from the sky, but from the fact that the pressure in a tornado is low. As air enters a tornado it is decompressed rapidly, and cools as a consequence. This is predicted by gas laws. In many cases the temperature inside a tornado is less than the dew point, which is why the funnel forms.
Yes the pressure drops as the tornado forms and progresses. The tornado's lowest pressure is in the center.