When objects are magnetized what occurs to give them their magnetic properties?
they gain a magnetic force.
they gain magnetic properties.
they gain a magnetic pole.
their magnetic domains are aligned.

Their magnetic domains are aligned  is a correct option.

Explanation:

When the objects are magnetized their magnetic domain is the region in which all the atom are aligned in the uniform direction.

Which means that all the atom are aligned in the same direction when it magnetized.

Domains are the region present within the magnetic material.Magnetic domains which cause the magnetic behavior of the ferromagnetic materials such as alloys, cobalt, and iron.

Thus when the objects are magnetized magnetic domain experienced a magnetic field, and the atoms are aligned in the same direction and given them their magnetic properties.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.