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Organisms respond to diverse stimuli . For example , plants can bend toward a source of light , climb on fences and walls , or respond to touch . Even tiny bacteria can move toward or away from chemicals -LRB- a process called chemotaxis -RRB- or light -LRB- phototaxis -RRB- . Movement toward a stimulus is considered a positive response , while movement away from a stimulus is considered a negative response . Single-celled organisms reproduce by first duplicating their DNA , and then dividing it equally as the cell prepares to divide to form two new cells .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.