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.

For a to be healthy, it has to have lots of different kinds of plants and animals. all of the different types of plants and animals in an ecosystem. name four types of ecosystems from those listed in the video. b) c) d) most living things live here. all living things depend on how an ecosystem like a game of sticks? why should we build new buildings on existing land? name four extinct species from those listed in the video. b) c) d) the best way to wipe out a species is to the largest ecosystem in the world is this percent of the world is covered by water. how many of all species in the world live in the ocean? list five things you can do to increase biodiversity. b) c) d) e) how many species are we losing per hour?

How many types of rock can form from the rock cycle

Match the description of each organism to the appropriate category