What set darwin's theory of natural selection apart from the theories that scientists proposed before him? no scientist had such formal training. no scientist had thought of it before. darwin based his theory purely on speculation. darwin based his theory on a wealth of evidence.

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Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla

This is the interaction of two organisms where one is and the other is neither nor harmed.