Answer:
Adaption radiation
Explanation:
This process explains how organisms transform rapidly due to the changes within their environment. When a change occurs it created new challenges, new resources are available, as well open up to new environmental niches.
Cross-breeding Hope it helps
The layers above would be not as old and the layers below would be the older layers.
The removal of predators from these guppys would most likely result in the explosion of the population of guppys and this in turn would most likely upset nature's balance for example the extra guppys would eat more of the available food and strain the food resources of their apparently marine eco-system.
It might be because it is close to the earth
Hope this helps!