= Solution
<Bosons> have symmetric many-particle states, so any number may occupy the same one-particle state. At low <temperature>, an ideal Bose gas therefore places a macroscopic population in its lowest one-particle state; below the critical temperature this is <Bose-Einstein condensation>.
<Fermions> have antisymmetric many-particle states and obey the <Pauli exclusion principle>, so each one-particle state can hold at most one fermion of each available internal label. At zero temperature, a noninteracting Fermi gas fills distinct states in increasing order of <energy> up to the <Fermi energy>. Its many-particle ground state is thus the filled <Fermi sea>.
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