Select all of the following that are postzygotic isolating mechanisms.
A. Hybrids develop abnormally.
B. Hybrids cannot be formed.
C. Hybrids fail to become established in nature.
D. Hybrids are sterile.
Answer: D
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A rosebush needs to increase the concentration of phosphorus in the water within its xylem. Assuming that there is plenty of usable phosphorus dissolved in the water of the surrounding soil, how can the rosebush achieve this?
A. by transporting more phosphorus across the root cortex B. by transporting more phosphorus across root hairs C. by transporting more phosphorus across the root endodermis D. by transporting more phosphorus across the epidermis of roots
Members of the subphylum include spiders, ticks, mites, scorpions, and horseshoe crabs. Their first
pair of appendages are fanglike structures used for biting prey, and their second pair of appendages, called pedipalps, are used for many different activities.
a. Myriapoda b. Trilobita c. Chelicerata d. Hexapoda e. Crustacea
What percentage of human DNA is devoted to coding exons?
a. 1% b. 1.5% c. 25% d. 50% e. 100%
The emerging and scientific consensus about "secondhand smoke" supports the conclusion that while airborne particles emitted by the lit end of cigarettes pose a health risk to those who are exposed, the gases released by a cigarette are relative
harmless. Indicate whether the statement is true or false