The crossopterygians were well adapted to move onto the land because they had
a. lungs. d. all of the above
b. a means of locomotion. e. A and B
c. a cartilaginous skeleton
E
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Dome-headed dinosaurs (pachycephalosaurs) are only known to us from ____ rocks
A)early Triassic B)early Jurassic C)late Jurassic D)early Cretaceous E)late Cretaceous
What is a water table?
a. A boundary between an unsaturated zone and groundwater. b. An impermeable rock mass that stops percolating water. c. A relatively high location of the unsaturated zone in the soil. d. An isolated geologic feature that slowly stores water over time. a. A boundary between an unsaturated zone and groundwater.
What effect has HIV/AIDS had on Sub-Saharan Africa? In which areas of the region has the spread of this disease been the greatest? What are the reasons for the variation of rates of this disease among different countries in the region?
What will be an ideal response?
The most stable predator-prey relationships typically involve communities in which there are
A) many prey species and several natural predators. B) many species of carnivores eating each other. C) only bottom-up population regulation. D) only top-down population regulation.