Why are Australian mammals all marsupial while mammals on other continents are mostly placental? Group of answer choices When the continents separated from one another, marsupials in Australia did not have the placental competitors that were present in the Americas. Australian mammals have a different common ancestor than mammals elsewhere in the world. Marsupials outcompeted the placental mammals in Australia. The placental anatomy is better adapted to the environments of North and South America than is the anatomy of marsupial mammals. The marsupial anatomy is better adapted to the environments of Australia than is the anatomy of placental mammals.

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law

30 points ! can someone classify this for me their kingdom,phylum,class order,domain,family,genus and species ? 1.rosales 2.eurarya 3.rosaceae 4.cania 5.plantae 6.magnoliopsida 7.rosa 8.magnoliophyta