<span>Researchers transplanted guppies from pools containing pikeÂcichlid fish (intense guppy predators) to pools containingkillifish (less active predators that prey mainly on juvenile guppies). They then determined whether color patterns in thetransplanted population changed over time.
Researchers hypothesized that predation should result in selection for more drab colors in guppies because guppieswith bright colors are more conspicuous to predators.</span>
This is very easy you should read over it again
The sentence had repetitive words replaced with synonyms and pronouns. "but my father disliked..." is too much alike to "my father disliked" so it would get tedious and harder to read.
They replaced it with "but he hated ... " to get some variation.
