Natural Selection: Over time the very large or very small sharks were able to survive as the large ones were able to prey on whales and other sharks while the smaller ones were fast enough to prey on smaller prey.The medium sharks had neither advantage and were slowly pushed out.
Sexual Selection: Males who were more dominant were able to scare away their male competitors and then mate with the female. Some females would also choose males with the larger dorsal fin which would be intrasexual selection.
Mutations: many Mutations have occurred over time a major one being the ability to change the colour of their skin and the change in size and ability to breathe out of the water.
Sharks share some analogous features with dolphins as they both have fins that work and look similar but stem from different ancestors.
The great whites lungs that enable them to breathe outside the water are their most prominent vestigial feature and they were able to develop it back,
Sexual Selection: Males who were more dominant were able to scare away their male competitors and then mate with the female. Some females would also choose males with the larger dorsal fin which would be intrasexual selection.
Mutations: many Mutations have occurred over time a major one being the ability to change the colour of their skin and the change in size and ability to breathe out of the water.
Sharks share some analogous features with dolphins as they both have fins that work and look similar but stem from different ancestors.
The great whites lungs that enable them to breathe outside the water are their most prominent vestigial feature and they were able to develop it back,