A requirement of cladistics is that a grouping must include ________
A) species that can interbreed
B) only living species
C) species with shared traits
D) a common ancestor and all its descendants
D
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What is the difference between negative feedback and positive feedback mechanisms?
A. Negative feedback mechanisms return a system to a set point; positive feedback mechanisms amplify a response. B. Negative feedback mechanisms move away from a set point; positive feedback mechanisms stabilize toward a set point. C. Negative feedback mechanisms stabilize a system toward a set point; positive feedback mechanisms change the set point.
Which statement describes the greenhouse effect?
A) Most life on Earth relies upon the hospitable temperatures resulting from the greenhouse effect. B) The greenhouse effect is a dangerous phenomenon that should be stopped as soon as possible. C) The greenhouse effect results from the presence of oxygen in the atmosphere. D) Global warming is likely the result of a lessening of the greenhouse effect.
Small cells function more effectively, because as cells become larger their surface area to volume ratio
A. decreases proportionally to the radius of the cell (r). B. stays the same. C. increases proportionally to the radius of the cell (r). D. increases proportionally to the cell's radius squared (r2). E. decreases proportionally to the cell's radius squared (r2).
In his book The Origin of Species, Darwin argued that species living today descended from a succession of ancestral species. What mechanism did Darwin propose to explain how evolution occurs?
A. competition B. natural selection C. artificial selection D. overproduction