In an ecosystem, a population can be defined as
a.
all the individuals of a species that exist together at a given place and time.

b.
all individuals of a species born in a specified month in every region of the world.

c.
all individuals of a species that exist or have existed in a given place.

d.
all the individuals of every species at a given place and time.

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

wher is the rest of the question