If the apple and haw flies no longer interbreed due to the different ripening times of apples and hawthorns, this would be an example of what kind of reproductive isolating mechanism?
A) temporal isolation
B) ecological isolation
C) gametic isolation
D) mechanical isolation
E) behavioral isolation
Answer: A
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a. xylem b. vascular cambium c. primary phloem d. secondary phloem
While running in a garden, a girl steps on an old board and a nail goes through her shoe and skin,
causing a deep puncture wound. Which of the following non-specific defense mechanisms will aid in defense from pathogens?
a. epithelial cells with cilia b. lysozyme c. acidic skin secretions d. inflammation e. natural killer cells
The Burgess Shale formation in eastern British Columbia includes a wide variety of animal fossils such as Hallucingenia and Opabinia. When was the Burgess Shale formed?
a. about 8000 years ago b. about 78 million years ago c. about 505 million years ago d. about 4 billion years ago
After examining the phylogenetic tree of Micobacterium tuberculosis depicted in the figure above, give a pos-sible explanation for the appearance of a split branch having tips in both the Philippines and the rim of the Indian Ocean
What will be an ideal response?