Water, carbon dioxide, oxygen, and some other substances can pass through the cell wall. （true or false，and please tell me why？Thank you）

New york city has 2,181 inhabitants per square mile. the state of alaska has 1.03 inhabitants per square mile. ecologists would say alaska has a low exponential growth population density birth rate carrying capacity

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel

Climate like that in the sahara desert have the fastest rates of weathering