Unlike rocks, all minerals and
a are expensive, are difficult to get

b occur naturally, have a fixed chemical composition

c contain metal, dissolve in acid

d fracture, contain silica

The correct answer is B!

Why is this?

A mineral is a naturally occurring, inorganic solid with a definite crystalline structure and chemical composition. All minerals contain one or more elements, which are pure substances that cannot be broken down into simpler substances by chemical means.

d.

hope to be marked brainliest

"do a testcross with a homozygous recessive plant."