There have been five mass extinctions in the last 450 million ...

[rlane42]

There have been five mass extinctions in the last 450 million years. What are some of the possible cataclysmic events that lead to these mass extinctions?

Question 2

____ is the tool to finding solutions for environmental problems.
 A) Education
  B) Research
  C) Commissions and policies
  D) Time

[juwms]

Answer to Question 1

Scientists are not always certain of the cause of causes of each mass extinction, but leading candidates for a couple of these events include the collision of an asteroid or comet with Earth, or massive volcanism leading to rapid climate change. Other potential contributing factors or mass extinctions may include the breakup, collision, or rearrangement of continents, changing currents patterns, or even large-scale oceanic anoxic events.

Answer to Question 2

A

[rlane42]

TY

[juwms]

You're welcome