If a disturbance were to occur in an ecosystem, which of the following ecosystems would be most vulnerable to extinctions?
question 9 options:

continental ecosystems

island ecosystems

marine ecosystems

tropical ecosystems

Which flexible structure that supports the nerve cord and led to the backbone

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 layer will become saturated first when rain falls?