Question

which of the following can cause extinction?
increased variation
successful reproduction
drastic environmental changes
stable populations

Explanation:

To determine what causes extinction, we analyze each option:

• "Increased variation" generally helps species adapt, not cause extinction.
• "Successful reproduction" supports population growth, reducing extinction risk.
• "Stable populations" imply a balanced ecosystem, less likely to cause extinction.
• "Drastic environmental changes" (like climate shifts, habitat destruction) can outpace species' ability to adapt, leading to extinction.

Answer:

B. Drastic environmental changes