  We provide theoretical evidence that the neutrino is a Majorana fermion. This
evidence comes from assuming that the standard model and beyond-standard-model
physics can be described through division algebras, coupled to a quantum
dynamics. We use the division algebras scheme to derive mass ratios for the
standard model charged fermions of three generations. The predicted ratios
agree well with the observed values if the neutrino is assumed to be Majorana.
However, the theoretically calculated ratios completely disagree with known
values if the neutrino is taken to be a Dirac particle. Towards the end of the
article we discuss prospects for unification of the standard model with
gravitation if the assumed symmetry group of the theory is $E_6$, and if it is
assumed that space-time is an 8D octonionic space-time, with 4D Minkowski
space-time being an emergent approximation. Remarkably, we find evidence that
the precursor of classical gravitation, described by the symmetry $SU(3)_{grav}
\times SU(2)_R \times U(1)_{grav}$ is the right-handed counterpart of the
standard model $SU(3)_{color} \times SU(2)_L \times U(1)_Y$.
