Answer :
The presence of a greater number of low-armored sticklebacks in the freshwater is due to a process called as adaptation by natural selection.
When sticklebacks move from the ocean to the freshwater, they will encounter new challenges, such as the lack of predators or the different food sources. Over time, some of the sticklebacks will develop genetic mutations that will allow them to better survive and to reproduce in their new environment.
In this case, the low-armored variety of the sticklebacks has a genetic advantage because it grows more quickly and becomes too big as well as fast to be preyed upon by dragonfly larvae, which are common predators in freshwater environments. As a result, low-armored sticklebacks are more likely to survive as well as pass on their genes to the next generation. Over time, the proportion of the low-armored sticklebacks in the population will increase, leading to a greater number of low-armored individuals in freshwater.
This process of adaptation by natural selection is a key aspect of the evolution and helps populations of organisms to better adapt to changing the environments over time.
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