The most likely cause of the bottleneck in Africa is a huge volcanic eruption that occurred 71,000 years ago in Sumatra.
(The most likely cause of the bottleneck in Africa; is; a huge volcanic eruption that occurred 71,000 years ago in Sumatra) (a huge volcanic eruption; occurred; T:71,000 years ago; L:in Sumatra)
The most likely cause of the bottleneck in Africa a huge volcanic eruption
is occurred
a huge volcanic eruption that occurred 71,000 years ago in Sumatra
T:71,000 years ago L:in Sumatra