________ are endotherms, and ________ are ectotherms.
A. Birds; lizards
B. Birds; mammals
C. Lizards; mammals
D. Mammals; birds
Answer: A
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Gray water from your toilet can be used to water your yard.
Answer the following statement true (T) or false (F)
The Kyoto Protocol marks the most prominent attempt of the global community to take comprehensive action to
A) reduce greenhouse gas emissions. B) eliminate trade in hazardous wastes. C) reduce risks from nuclear energy. D) save the world's remaining rainforests.
A ________ of sea-level causes a lowering of base-level and ________ in the lower part of a stream valley that terminates in the ocean
A) rising, incision B) rising, sedimentation C) lowering, sedimentation D) lowering, incision
In the Soviet period, Russia graduated many engineers from college. Today, one of the most popular aspirations of college students is:
A) engineer B) mathematician C) manager D) farmer