I think its D im not sure hope this helped
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
<span>the answer is physical boundary</span>
Answer: 180 degrees
Explanation:
Take 360 and divide it by 2.