Brown-headed cowbirds lay their eggs in the nests of other species of songbirds, relying upon the other species to raise their chicks. Many of these species unknowingly raise the cowbird chicks at the cost of their own reproductive success
The relationship between cowbirds and these other species of birds most closely matches which one of the following relationships?
A) Parasitism B) Commensalism
C) Mutualism D) Intraspecific competition
A
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How will biomes such as tundra and boreal forest respond to a warming climate?
A) They will disappear B) They will shrink in size C) Their boundaries will shift poleward D) Their boundaries will shift toward lower latitudes E) Biomes don't change because the climate does
A shear fold?
What will be an ideal response?
Why is soil a nonrenewable resource?
A) Because it forms very slowly B) Because there is a limited amount of soil on the Earth and it cannot be replaced C) Because it is not commonly used for human commerce D) Because it cannot be privately owned
The zone of aeration _____
a. lies directly beneath the zone of saturation b. lies directly beneath the water table c. is an aquiclude d. lies directly above the intermediate zone e. lies directly above the zone of porosity