To answer this question properly requires physics that has not yet been discovered of agreed upon, specifically the number of the spatial dimensions in the universe. We do know, however, that there are more than two spatial dimensions. A circle is only 2 dimensional, while a sphere is 3 dimensional.
Also consider that protons are not solid. The best way to think of a proton (unless you get heavily involved in physics) is a point in space that has properties such as mass and charge, etc. In this view, the proton is neither circular nor spherical, being a volumeless point.
If you are talking about coccus bacteria, then they can cause infections, and nasty aliments. A circular bacteria is called a coccus.
spherical shape
If it's a string of circular bacteria it's a chain of cocci (spherical) bacteria.
An atom's protons are in it's atomic nucleus, in a spherical ball stuck together with neutrons.
There is no "behind" a black hole. A black hole is not a circular disk. The event horizon is spherical, with a singularity at the center. That singularity is an infinitely dense point.
circular spherical shape
Round spherical circular
A football is circular, or rather spherical, because no other shape will roll in any direction.
The adjective round has the synonyms coiled, curled, spherical, and circular.
Yes or to be more precise they are spherical
spherical, orbicular, circular, ringed, globular.
The root word of "spherical" is "sphere" (a 3D circular figure). "-ical" is a suffix meaning "of or pertaining to something" and in this case spherical means "of or pertaining to a sphere".
If you are talking about coccus bacteria, then they can cause infections, and nasty aliments. A circular bacteria is called a coccus.
spherical shape
Radius is a sensible measure to use with a circular (or spherical) shape. England is neither.
The sphere forms a circle in the plane. There are two bits of sphere which are spherical caps with a circular base.
If it's a string of circular bacteria it's a chain of cocci (spherical) bacteria.