What is being defined below? a dark, organic material composed of partly decayed leaves and plants that adds nutrients and water-retaining ability to soil
a. humus
b. deciduous
c. top soil
d. coniferous

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 galapagos island contain 13 species of finches four of the species are seen here it is believed that all of the species had one common ancestor and overtime

What is the difference between how ionic and covalent bonds form