How did the location (placement) of the cities on the map affect trade?A. They used the rivers as transportation (moving goods).B. The surrounding desert made travel easier. C.They could only travel south on the rivers. D.The cities were spread too far apart for trade

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

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?

Which image shows labeled organelles that are present only in plant cells?