The presence of which organelle indicates that eukaryotic cells have evolved from prokaryotic cells?

Most of the carbon on earth is stored in the form of

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

What factors contribute to the effect an environmental toxin has on the human body?