Why would migration to an island by a single pair of birds be likely to lead to adaptive radiation in their descendants?
What will be an ideal response?
ANSWER: Islands are often poor in species, with many unoccupied ecological niches, because
relatively small numbers of animals are capable of crossing large expanses of ocean.
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Settlers to the United States found between
__________ and __________ passenger pigeons. They are extinct today. a. 15,000-25,000 b. 3-5 billion c. 50-100 million d. none; they are native to Europe e. none of these
First exposure to the allergen (hapten) causes an increase in the number of:
A. Th1 cells B. B cells C. antibodies D. cytotoxic T cells
In a nucleotide triphosphate, to which carbon on the deoxyribose will the base be found?
A) 5' B) 2' C) 3' D) 1' E) 4'
The cardiovascular system consists of the heart, blood vessels, and skeletal muscles.
Answer the following statement true (T) or false (F)