Which of the following sampling techniques represents an index of abundance rather than an estimate of density? a. ratio of marked and unmarked mice in a field.
b. density of oak trees within a quadrat.
c. number of duck calls captured by microphones.
d. number of bears observed along transects.

Which number shows the location of the united kingdom of great britain? 7 5 2 4

Study the image. which feature is modeled in the diagram? check all that apply. 1 a convergent boundary is formed. 2 continental plates are colliding. 3 two plates are forming a divergent boundary. 4 continental plates are sliding past each other. 5 several mid-ocean ridges are formed on earth’s surface.

What is the difference between emigrate and immigrate? ?