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Ehleringer and Clark found that variation in leaf pubescence among plants of the genus Encelia appears to correspond to the distribution of these species along a ________ gradient from the California coast eastward.
Semipermeable Membrane
A membrane that allows the passage of certain molecules or ions but restricts others, crucial in processes like osmosis.
High Temperatures
Conditions involving elevated temperatures, often influencing chemical reactions or physical states of matter.
Activation Energy
The minimum amount of energy required to initiate a chemical reaction.
Endergonic
A chemical reaction in which the standard change in free energy is positive, and energy is absorbed from the surroundings.
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