Atype of trilobite is used as an index fossil. these fossils were made about 540 million years ago. a scientist finds a trilobite fossil in layer 5 in the diagram below. what can the scientist conclude from this finding?

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment

9. the history of life on earth is recorded in

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