A small amount of fluid is contained in the pleural cavity to
A) promote the exchange of nutrients with both lungs.
B) allow gas exchange between the lungs and the blood stream.
C) allow white blood cells and macrophages access to foreign antigens entering the body through air.
D) function as a lubricant as the lungs move during ventilation.
E) serve as a shock absorber for the lungs during body movement.
D
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All biological research is undertaken with the explicit or implicit recognition that ____
a. Charles Darwin's view of evolution put forth in The Origin is without error b. all forms of life are related and have evolved from ancestral forms c. all species share the same common ancestor d. the products of evolution are easily predicted e. the theory of evolution can be ignored unless the research is explicitly examining evolutionary process
Glucose moves through a protein transporter down its concentration gradient into the cell. This is an example of ____
a. diffusion b. endocytosis c. exocytosis d. osmosis e. facilitated diffusion
The three processes that are commonplace throughout the evolutionary history of a species and illustrate that macroevolution is not goal-directed are speciation, diversification, and extinction.
Answer the following statement true (T) or false (F)
What are homologous traits?
a. characteristics that are similar in two species because they inherited the genetic basis of the trait from their common ancestor b. characteristics that are different in two species because they inherited the genetic basis of the trait from a different ancestor c. characteristics that are similar in two species because they are used for the same function d. characteristics that are similar in two species because two species look similar