The shape of the beaks of Darwin's finches and industrial melanism are often cited as examples of the process of _______________ leading to evolutionary change.
A. artificial selection
B. coevolution
C. intelligent design
D. founder effect
E. natural selection
E. natural selection
Natural selection occurred in both of these examples; the pressures leading to the selection of deeper beaks following drought or darker pigmentation following pollution were environmental changes. Natural selection is the change in allele frequencies from one generation to the next in response to changes in environmental pressures.
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Which ecological role is least likely to be performed by bryophytes?
a. enhancing the water-holding capacity of garden soil
b. stabilizing soil surfaces with a biological crust in harsh places c. supplying a food source for animals in the arctic tundra d. providing pollination services for agricultural crops e. helping to build soil on bare rock
What is one important concept to consider when planting genetically modified plants?
What will be an ideal response?
Which of the following may trigger a migraine headache?
a. hormonal changes b. fluorescent lights c. certain foods d. weather changes e. all of these
The process by which DNA makes a copy of itself is called:
a. replication b. translation c. transcription d. interphase.