What is the largest percentage of land use in the United States?

The seed coat's most important function is to provide a) a nonstressful environment for the megasporangium. b) the means for dispersal. c) dormancy. d) a nutrient supply for the embryo. e) desiccation resistance.

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

18. which statement about cancer is true?