Which term describes the difference in the concentrations of a substance across a cell’s membrane? concentration gradient molecular concentration diffusion membrane concentration membrane

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

What is a cordon and where is it found

Where would you expect to see seedless plants, such as ferns and mosses? a. in a botanical museum, because they are all extinct b. low and close to the ground in a moist environment c. climbing high while circling the branches of another plant d. deeply rooted in a forest with a trunk that reaches 20 meters or more