Which statement forms the basis of Faraday’s law of induction?
A changing magnetic flux establishes a current in a circuit.
A current flowing through a wire establishes a magnetic field.
The magnetic moment of a conducting loop carrying current depends on the area of the loop.
A permanent magnet creates a magnetic field at all points in the surrounding space.

d) physical means can be used to separate the components of air.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.