Bottleneck effect occurs when a population suddenly gets much smaller.
Population size is the predictor of extinction probability.
Bottleneck effect can be a precursor to extinction.
Bottleneck effect can be a precursor to what?

[a] massive damage
[b] Climate change
[c] Destroy bridges
[d] Cambrian explosion
[e] ground to shake
[f] clams
[g] soda
[h] extinction