What is herd immunity?
A) the protection offered to you by the size of your country, as it limits potential outside contact with an infected individual
B) at least 25 percent of the population needs to be immune before those too poor to receive the vaccination can be protected
C) the only protection available to those who are unable to receive immunizations due to medical reasons
D) small communities protect their children from being exposed to outside pathogens by limiting the contact their children have with outside visitors or workers
E) the only protection available to those who choose not to receive immunizations due to religious belief
Answer: C
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In its youth, a pet parrot was owned by someone who kept the wings clipped and never allowed it to fly. Later in life, the new owner let the feathers grow and let the parrot fly around the house. But the parrot kept knocking over lamps and crashing into walls. "Wow," said the owner, "I guess parrots are just too clumsy to fly around a house without destroying everything." What is an alternative explanation?
A. In nature, parrots have much more room to fly, and do not have to navigate around delicate home decor. B. Since the parrot was not able to practice flying during the critical period for flight development, the brain circuits for accurate flying were not able to develop. C. The parrot just needs more practice flying -- although it did not get to fly when young, this should not affect later ability. D. The critical period for flying development in the brain has just now begun with the bird's first attempt. In a few weeks the critical period will end, so it must practice during this time. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about behaviors in an adult parrot based on how it was raised? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Describe the challenges that plants faced when they entered the land, and how they overcame them.
What will be an ideal response?
Which of the following digestive system structures is greatly expanded in size in koalas, resulting in a very large surface area for prokaryotes to digest plant material?
A) stomach B) rumen C) cecum D) gall bladder
The West African black rhino, one of four subspecies of rhinoceros, was declared extinct in 2006. Their horns were believed by many to hold medicinal value. What is the most likely reason for the extinction of the West African black rhino?
A. pollution B. habitat loss C. climate change D. introduced species E. overexploitation