A chemical which consists of just one kind of atom is always: a molecule
an element
a mineral
a rock

cuz he's blad

explanation:

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: