14. What would be an example of an evolutionary bottleneck?

Bottleneck is an example of a genetic drift that happens when the size of a population is severely reduced.

The correct answer is d. the idea that T. rex held its tail aloft was supported by the studies of many scientists. This is how science works, things are discovered by having members of the scientific community do experiments and come to the same conclusion. Many of them confirmed this theory and a concensus was established.