The plasma membrane allows some molecular species to enter and excludes others. it is therefore referred to as a(n) membrane

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

What is the inability of an individual or a society to achieve a minimum standard of living known as ?