The following sentence is inaccurate, but it can be made accurate by exchanging two words within it (forms of articles may need to change to accommodate word switches):
The egg and sperm are both active participants in fertilization; both are activated by the other, and both activations involve changes in membrane ion concentration and calcium fusions.
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The sperm and egg are both active participants in fertilization; both are activated by the other, and both activations involve changes in membrane ion concentration and calcium fusions.