ANSWER:
I think it's the second one.
EXPLANATION:
in primary succession newly exposed or newly formed rock is colonized by living things for the first time. in secondary succession an area that was previously occupied by living things is disturbed, then recolonizeed following the disturbance.
High density Nebula, And condenses into a huge globule of gas and dust and contracts under its own gravity
Answer:
A nickel is a five-cent coin struck by the United States Mint. Composed of 75% copper and 25% nickel
Observing and measuring (A)