Answer: They existed for a short span of time.
Explanation:
Index fossils are also referred to as the indicator fossils and they are simply used to define the faunal stages.
Some of the characteristics possessed by the index fossils include:
• geographic distribution that's wide
• short vertical range
• rapid evolutionary trends.
Answer:
D
Explanation: thank you
C. Russia
According to land area it is the largest country
$15 by 2.60 times 4.5 is 11.7 and 11.7 plus 3.30 is 15