Answer:
Option D
Fish
Explanation:
The characteristics of index fossil is distinctive, widespread, abundant, and limited in geologic time. Ammonites fit these demands well and are the best-known fossils that have been widely used for this.
Thus, The answer is Fish
Answer:
\sqrt{2}
Explanation: signed, birb.
The area referred to in the question is missing but taking into account the area of the world as a whole, the answer would be A)Atlantic and Pacific.
North America that is the answer
The Earth's atmosphere is mostly Nitrogen ~ 78% and Oxygen ~21% gas.