What is a natural factor that would immediately likely decrease the ecosystem

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 is a testable hypotheses?

In meiosis ii during anaphase ii which structures separated homologous chromosomes or sister chromatids