To further reduce the possibility of biological contamination, MOST treatment plants treat the effluent with
A) fluorine.
B) chlorine.
C) ozone.
D) extreme heat.
Answer: B
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Under which circumstances does the zenk gene become active in zebra finches, and what is its effect?
What will be an ideal response?
Increases output of pancreatic juice
What will be an ideal response?
For over ________ years, dinosaurs dominated the face of the earth.
A. 1 million B. 10 million C. 150 million D. 10 thousand E. 50 million
When the London underground (subway) system was built in the nineteenth century, mosquitoes moved into the tunnels and became adapted to biting the customers and small animals that inhabit the subway system. Like people, mosquitoes can freely enter and
leave through the tunnel entrances. Recently, DNA analysis and attempts to cross-breed above-ground mosquitoes with underground mosquitoes indicate that there are now two different species. The underground insects are visibly larger. Which term best describes what has happened? A) behavioral incompatibility B) population bottleneck C) temporal isolation D) sympatric speciation