The natural philosophy of Aristotle and his colleagues was
a. mechanistic.
b. vitalistic.
c. a belief in absolute truth.
d. a and c.
d
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Which of the following research questions would a population geneticist be likely to ask?
A. How much genetic variability is found in sperm whales? B. How can we explain the amount of genetic diversity in Adelie penguins? C. Why do some species have more genetic diversity than others? D. All of the above are questions a population geneticist may ask.
The Cerulean warbler is a songbird that breeds in the eastern and middle United States and winters in Central America. Its numbers have been rapidly declining over the past 50 years. You are interested in the reasons for this rapid decline and so you gather data. The Brown cowbird is a brood parasite-it lays eggs in other bird's nests. Although native to parts of the United States, it has been invading new regions. The graph above shows data you collected on the abundance of Brown cowbirds and Cerulean warblers at various locations. Based on an inspection of the graph, what can you conclude?
A. Brown cowbird abundance is directly correlated with Cerulean warbler abundance. B. Brown cowbirds are responsible for the decline of the Cerulean warbler. C. Brown cowbirds do not appear to affect Cerulean warblers. D. The abundance of Brown cowbirds shows a negative relationship with Cerulean warbler abundance. E. Since both birds are native to the United States, the cowbird cannot be affecting the warbler.
In the human immune system, the first line of defense against any microorganisms or foreign material encountered is known as
A) Acquired immunity B) Adaptive immunity C) Specific immune response D) Nonspecific immune response
When "matching" a donated organ or tissue to a recipient, it is necessary that the ________ of the donor and the recipient be as similar as possible
A) blood type B) T helper cells C) antibodies D) APCs E) MHCs