Acast fossil is formed when
a) an organism leaves an impression in rock
b) an organism leaves a footprint
c) minerals fill in an impression left by an organism
d) when the remains of a living thing are preserved and turned into rock

The answer is D)
when the remains of a living thing are preserved and turned into rock

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.