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The ability of those variations to survive and be reproductively successful against other variations in the immediate selective environment. The coin evolution pays in is reproductive success.
The human with the greatest reproductive success personally, or have siblings with great reproductive success,
Behaviors that promote reproductive success are likely to be those that increase an individual's chances of survival, reproductive opportunities, and successful mating. This can include traits such as physical attractiveness, resource acquisition, social status, and mate choice strategies that maximize the chances of producing healthy offspring.
Adaptions that lead to greater survivability and reproductive success in the immediate environment of the individual organisms under selection pressure.
Natural selection.
The assurance of reproductive success.
Evolution, as defined by scientists today, is a undirected, purposeless mechanism. So, to answer your question, evolution is not driven by anything.In a sense, evolution is driven by reproductive variation and differential reproductive success. Reproductive variation providing random drift, and differential reproductive success providing a measure of "direction" to this drift.
Darwinian evolution is descent with modification and natural selection, or, in other terms, reproductive variation and differential reproductive success.
Mendels Law
mutant
Darwinian evolution is descent with modification and natural selection, or, in other terms, reproductive variation and differential reproductive success.
Success and strength? The coin evolution pays in is reproductive success. The only success is to have the genes represented in the population of the next generation and beyond. That depends on the strategies used and the local environment they are used in. Strength could be a strategy to maximize reproductive success, but that would be only one of many strategies and definitely dependent on the environment in question.