Answer:
D
Explanation:
I'm doing USA test prep and I got it right
I think the answer is approximately 4.12 billion years since the amount of years is 4.543 billion years
The answer is <span>B. element.
An element is composed of only one kind of atom and cannot be separated into simpler substances. Oxygen (O) is the element.
A compound is a substance composed </span><span>of two or more <em>different </em>atoms chemically bonded to one another, for example, water (H</span>₂<span>O) consists of 2 atoms of hydrogen (H) and 1 atom of oxygen (O), so it is the compound.
A mixture consists of two or more substances that are not chemically combined. Solutions and colloids are mixtures.</span>
I cannot see the whole equation.Therefore I shall not answer
