For a complete and exhaustive description of a particle you just need to define 3 spatial coord , x,y,z, and 3 speeds Vx,Vy,Vz
You may want to add also some angles but generally speaking a finite number of variables is enough
For an electron ( or a photon or an atom or a small molecule ) it is not sufficient

You must define a function in term of x,y,z and the time t
Something like

atom = f(x,y,z,t)

Dont worry about the physical meaning of the above function( nobody actually knows it )

The key point is that the atom looks like something diffused in the space, regardless of physical meaning of the value assigned to the spatial coords
In other words our atom is a sort of wave rather than a particle but do not assume that it is a real wave, it behaves like a wave
That's different

Ok, now let's consider a group of atoms , for example , our cat
How would you describe the cat in the mathematical language
Well the cat is made of atoms , so

Cat = f1(x1,y1,z1,t) + f2(x2,y2,z2,t) .....fn(xn,yn,zn,t)

with n = 1.00000000000000000000000000000000000000000000000.........000000000000000000000000000000000000000000000
False
Our cat is described by one only function with 3n + 1 variables rather than by n functions with 4 variable
Something like

Cat = f(X1,X2,...............X3n,t)

If you study this function you get the behaviour of our cat

Well if you do it you will find out that a cat behaves like .......a cat

In other words, all the amazing properties of quantum physics are valid only for a small number of isolated atomic entities



No, it will not explode
As I said we are just passive observers as far as entanglement is concerned