Reducing the activation energy can increase the rate of a reaction. Reducing the activation energy would mean that less energy is required to process a reaction, whereas increasing activation energy would require more energy to process a reaction.
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I think sister groups. Imagine them having the same parents.
cells are not the smallest unit of life because atoms are smaller than cells
Organisms that reproduce sexually have greater genetic and thus characteristic variations, and so, are able to withstand more selection pressures if they so happen to change or become greater. This increases the chances of survival for that species itself.
Organisms that reproduce asexually are genetically identical to each other. They are unlikely to withstand any changes in selection pressures.
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