D. As time progressed and different fossils from different time periods become fossilized, they show how their species evolved and changed over time.
When a scientist finds in the field, the scientist first compare to other known organisms to organisms that are physically similar to the organism. This is verified through encyclopedia and database of organisms. Then the scientist then compares genetically one organism to another organism.
Answer choices are missing, but the answer is Local extinction.
Its like character trats like..eye color
<span>Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly</span>