Natural selection refers to survival of organisms that are best adapted to their environment.
a. true
b. false
a. true
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How much of the light that reaches Earth's surface is captured by organisms?
a. One part in 2
b. One part in 20 c. One part in 200 d. One part in 2,000 e. One part in 20,000
The type of plate boundary can be determined by evaluating the depths of earthquakes. What seismic trend would occur at ocean-continent convergent boundaries?
A) ?The depth of earthquakes would increase as you move from oceanic crust toward continental crust. B) ?The depth of earthquakes could decrease as you move from oceanic crust toward continental crust. C) ?Earthquake depths would remain constant as you move from oceanic crust to continental crust. D) ?Only shallow earthquakes would occur along ocean-continent convergent boundaries.
The overlapping area between two major plant-dominated ecosystems is:
a. an ecotone where elements of both ecosystems intermingle b. a corridor separating the two ecosystems c. a patch with elements of both ecosystems d. a region with negative ecological optimum
Cobenefits of reducing greenhouse gas emissions include all of the following except
A) improved human health. B) improved air quality. C) increased renewable and sustainable energy development. D) fewer oil tanker spills. E) greater dependence on imported oil.