The idea that species that typically occupy the same communities should always be found together is known as the _____ view of communities
1.ecotonal
2.individualistic
3.interactive
4.successional
3
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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.
Which of the following statements about plant tissue culture is false?
A. Virus-free crop species can be propagated by culturing meristems. B. Individual cells can give rise to whole plants through tissue cultures. C. Synthetic hormones can be used to selectively promote root or shoot formation. D. Callus tissue can only form roots, not shoots. E. A callus is a mass of undifferentiated cells.
Describe amplification of hormone action
What will be an ideal response?
The region where a neuron transmitting an impulse comes in close proximity to a receiving neuron is the
A. synapse. B. junction. C. node of Ranvier. D. synaptic terminal.