Evidence for dark matter is exhibited by the
A. speed at which galaxies orbit one another within clusters.
B. degree to which galaxy clusters exhibit gravitational lensing effects.
C. relatively similar speeds at which all stars in a galaxy orbit the galactic nucleus.
D. all of the above
Answer: D
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Which of the following organisms can be called autotrophs?
a) ants, termites, and butterflies b) wolves, coyotes, and foxes c) rabbits, moles, and robins d) daisies, roses, and grass
People create and modify places at the same time that they are influenced by them
Indicate whether this statement is true or false.
Two useful indicators of overall health in a country or region are ____.
A. birth rate and death rate B. replacement-level fertility rate and total fertility rate C. life expectancy and death rate D. life expectancy and infant mortality rate E. population growth rate and death rate
The mechanism causing lithospheric plates to move is thought to be ________.
A. slab pull caused by a subducting lithosphere B. tidal forces C. Earth's rotation D. convection in the mantle E. a combination of convection in the mantle and slab pull caused by subducting lithosphere