Genes that modify the expression of other genes show:
A. dominance.
B. incomplete dominance.
C. recessiveness.
D. blending inheritance.
E. epistasis.
E
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Tissues of sharks are isotonic to seawater, but their concentrations of sodium ions, potassium ions, and chloride ions in cells and extracellular fluids are similar to those of freshwater fishes. What can you infer about the movement of sodium and chlorid
A) To maintain homeostasis of sodium and chloride levels, the shark must take up additional sodium and chloride from seawater. B) Sodium and chloride will diffuse into shark gills from seawater down their concentration gradient. C) Sharks conserve sodium and chloride, limiting excretion. D) Sodium and chloride must be eliminated through the gills.
Shallow water above the continental shelves is the:
1.Benthic region
2.Coastal zone
3.Neritic zone
4.Open ocean
5.Pelagic zone
Which of the following is/are TRUE
What will be an ideal response?
Four of the five answers listed below are related by a matching feature. Select the exception
a. blastocyst b. amnion c. allantois d. yolk sac e. chorion