Epithelial tissues can be classified as simple or stratified based on the number of layers of cells in the tissue. Why do you often find simple epithelial tissues in areas where diffusion often occurs?

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?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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