As we learned, living things respond to their environments. Anything that causes a living organism to react is called a stimulus. ... Living things respond to stimuli and adjust themselves to maintain balance; this is called homeostasis. For example, when the sun gets too bright, your pupils get smaller.
Answer:Enzymes ensure that the reaction continues without inhibition even if conditions such as temperature and pH are changed. The products of the reaction are released from the active sites of the enzyme, allowing other substrate molecules to bind with the sites.
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The evidence suggests that these chloroplast organelles were also once free-living bacteria. The endosymbiotic event that generated mitochondria must have happened early in the history of eukaryotes, because all eukaryotes have them
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