Which of the following is a value of biodiversity?
a. healthy ecosystems
b. pollution
c. invasive species
d. climate change

What feature of cell theory is best demonstrated in the image

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.

Which of the following explains why a tree is often used as a model to represent the principle of common descent