Answer: I would go with B. Here’s why: An index fossil is usually easily recognizable, and underwent a wide geographic distribution. What leads me to believe B is the correct answer, is because it’s something that existed “ all over the world”.
Answer:
Both have dinosaurs as ancestors (basically both are related to dinosaurs)
Explanation:
Answer: The process of change in the living parts of the ecosystem is called succession.
Explanation: Change-And ecosystem changes over time and can undergo development through a process called succession.