Question: What do composite particles include?
About the article "Subatomic particle", section "By composition".

Candidate passages:
Identical particles, also called indistinguishable or indiscernible particles, are particles that cannot be distinguished from one another, even in principle.
Species of identical particles include, but are not limited to elementary particles such as electrons, composite subatomic particles such as atomic nuclei, as well as atoms and molecules.
Quasiparticles also behave in this way.
Although all known indistinguishable particles are "tiny", there is no exhaustive list of all possible sorts of particles nor a clear-cut limit of applicability; see particle statistics #Quantum statistics for detailed explication.
There are two main categories of identical particles: bosons, which can share quantum states, and fermions, which do not share quantum states due to the Pauli exclusion principle.
Examples of bosons are photons, gluons, phonons, and helium-4 atoms.
Examples of fermions are electrons, neutrinos, quarks, protons and neutrons, and helium-3 atoms.
The fact that particles can be identical has important consequences in statistical mechanics.
Calculations in statistical mechanics rely on probabilistic arguments, which are sensitive to whether or not the objects being studied are identical.
As a result, identical particles exhibit markedly different statistical behavior from distinguishable particles.
For example, the indistinguishability of particles has been proposed as a solution to Gibbs' mixing paradox. 
What has this theorem got to do with emergence/composite theories?If let's say gravity is an emergent theory of a fundamentally flat theory over a flat Minkowski spacetime, then by Noether's theorem, we have a conserved stress–energy tensor which is Poincaré covariant.
If the theory has an internal gauge symmetry (of the Yang–Mills kind), we may pick the Belinfante–Rosenfeld stress–energy tensor which is gauge-invariant.
As there is no fundamental diffeomorphism symmetry, we don't have to worry about that this tensor isn't BRST-closed under diffeomorphisms.
So, the Weinberg–Witten theorem applies and we can't get a massless spin-2 (i.e.
helicity ±2) composite/emergent graviton.
If let's say we have a theory with a fundamental conserved 4-current associated with a global symmetry, then we can't have emergent/composite massless spin-1 particles which are charged under that global symmetry. 
Long-lived neutral particles provide a challenge in the construction of particle detectors, because they do not interact electromagnetically, except possibly through their magnetic moments.
This means that they do not leave tracks of ionized particles or curve in magnetic fields.
Examples of such particles include photons, neutrons, and neutrinos. 
Aggregate is the component of a composite material that resists compressive stress and provides bulk to the composite material.
For efficient filling, aggregate should be much smaller than the finished item, but have a wide variety of sizes.
For example, the particles of stone used to make concrete typically include both sand and gravel. 
In the physical sciences, subatomic particles are particles smaller than atoms.
(although some subatomic particles have mass greater than some atoms).
There are two types of subatomic particles: elementary particles, which according to current theories are not made of other particles; and "composite" particles.
Particle physics and nuclear physics study these particles and how they interact.
In particle physics, the concept of a particle is one of several concepts inherited from classical physics.
But it also reflects the modern understanding that at the quantum scale matter and energy behave very differently from what much of everyday experience would lead us to expect.
The idea of a particle underwent serious rethinking in light of experiments that showed that light could behave like a stream of particles (called photons) as well as exhibit wave-like properties.
This led to the new concept of wave–particle duality to reflect that quantum-scale "particles" behave like both particles and waves.
Another new concept, the uncertainty principle, states that such their properties as position and momentum cannot be measured exactly.
In more recent times, wave–particle duality has been shown to apply not only to photons but to increasingly massive particles.
Interactions of particles in the framework of quantum field theory are understood as creation and annihilation of "quanta" of corresponding fundamental interactions.
This blends particle physics with field theory.