The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar, yet they all differ markedly from their ancestral population in Asia. This is probably an example of ________
A. gene flow.
B. sexual selection.
C. disruptive selection.
D. founder effect.
E. directional selection.
Answer: D
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Which of the following experiments is the best way to determine if an element is essential for plant growth?
A) Measure the amount of the element stored in plant tissues. B) Measure the amount of the element in the soil after plant growth. C) Measure the weight of the plant and soil before and after plant growth. D) Grow a plant using hydroponics with and without the element.
The ____________________ theory describes how interactions between actin and myosin produce skeletal muscle
contractions. Fill in the blank(s) with the appropriate word(s).
What is a virus?
A) an organism in domain Archaea B) an organism in kingdom Protista C) an organism in domain Bacteria D) a non-living particle
What are the consequences of lesion bypass?
What will be an ideal response?