In geology, permeability is the capacity of a rock or sediment to move water or other fluids through it's pore space. Things with high permeability would be things like beach sand or a loosely packed...
In earth science, permeability is a measurement of the ease with which a liquid or gas is able to travel through a porous solid material. In physics, (specifically electromagnetism) it is the ability...
Solids have fixed shapes and volumes.
Liquids have more or less a fixed volume (but may be moderately compressible). They take on the shape of their container.
Gasses take on the shape and...
If the animal has some type of hair on it's body, warm blooded, and gives birth to live babies (NO EGGS) then it is a mammal. There are some exceptions such as the armadillo and platypus...