Describe a sustainable resource as one which is produced as rapidly as it is removed from the environment so that it does not run out

Relate the structure of xylem vessels to their function, limited to: (a) thick walls with lignin (details of lignification are not required) (b) no cell contents (c) cells joined end to end with no cross walls to form a long continuous tube

Describe the effects of non-biodegradable plastics, in both aquatic and terrestrial ecosystems