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 chloride in these animals?

A) Sharks conserve sodium and chloride, limiting excretion. B) To maintain homeostasis of sodium and chloride levels, the shark must take up additional sodium andchloride from seawater. C) Sodium and chloride will diffuse into shark gills from seawater down their concentration gradient. D) Sodium and chloride must be eliminated through the gills.

telophase and anaphase

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consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

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the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.