What is the state of maintaining a stable internal environment despite chnging external conditions

What is thought to have caused the mass extinction at the end of the cretaceous period?

Residential construction is expanding in florida, the expansion has caused fragmentation of habitats, one of the results of the increased construction is a decrease in the number of large predators such as the coyote, black bear and pool panther, which will be the most immediate local result of this fragmentation? 1)large predators will become extinct 2)decrease in middle sized predators 3)increase in population of top carnivores 4)increase in population of prey species

The diagram shows a chicken embryo and a human embryo