Answer:
takes in carbon dioxide, puts out oxygen
Explanation:
<h2>540 million years ago
</h2>
Paleozoic.
Era immediately follows Precambrian It lasted about 4.5 billion years.
When did abundant fossil evidence first appear in the geologic record.
540 million years ago.
Answer:
C
Explanation:
0.20-0.10=0.10
because the population was decreased