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Organisms are required for evolution to occur. Evolution is defined as something that happens when organisms reproduce.
The rate of evolution.
Asexual because they can produce by themselves
Evolution is the effect caused by the interaction of organisms and their environment, organisms and other organisms, organisms and their genes, and so on. The simplest answer to this question is that organisms produce and propagate replications of the alleles they carry: they reproduce.
All living organisms: Grow, Reproduce, Respond to their environments, Use Energy, Have Life Spans
the unequal ability of individuals to survive and reproduce
Natural Selection. Survival of the fittest. The organisms with the best traits are able to survive and reproduce.
Genetic and morphological variation. Without variation in organisms there would only be the shifts of genetic drift and gene flow in organisms. When organusms are varied then one can be selected from the other by the environment and the organisms ability to reproduce against that environment. Then there is evolution.
Reproductive variation is central to evolution. All else in evolutionary theory follows directly or indirectly from the fact that organisms reproduce with variation.
Survival of the fittest, evolution, you choose. The organisms with the best genetics are the ones who survive to reproduce and pass on their good genes, where the organisms with poor genetics die and do not pass on theirs.
One word: extinction. As long as life exists, organisms will reproduce with variation - which means per definition that evolution will occur. The only way for evolution to stop happening is for life to cease existing.
Evolution occurs when life forms reproduce with genetic variation of inherited traits, within an environment with a limited carrying capacity (which is basically all environments). In other words, evolution happens where life as we know it exists.