Among the given choices, an example of homeostasis is the first choice, which is when a cactus <span>stores water during wet periods, allowing it to live through dry periods
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Homeostasis refers to the ability or tendency of a system (i.e. physiological) to maintain a stable internal environment even when environmental or external conditions may change or vary.
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The other examples given in the choices do not reflect equilibrium because they depict the inability of the body or organisms to maintain a stable internal environment because of failure to cope with changes in the external environment (too much heat, cold, and water loss).
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Eukaryotes (IPA: [juːˈkæɹɪɒt]) are organisms whose cells are
organized into complex structures by internal membranes and a
cytoskeleton. The most characteristic membrane bound structure is the
nucleus. This feature gives them their name, (also spelled "eucaryote,")
which comes from the Greek ευ, meaning good/true, and κάρυον, meaning
nut, referring to the nucleus. Animals, plants, fungi, and protists are eukaryotes.