Answer:
A
Explanation:
Mutualism is A symbiotic relationship between two species in which both partners benefit
Cant really explain, for say, but its D.-ide
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Answer: The ionization of pure water forms <u><em>hydroxide and hydronium ions.</em></u>
Explanation:
Ionization is a reaction in the pure water in which water breaks down into its constituting ions that hydronium ion and hydroxide ions.

One molecule of water looses its proton to form hydroxide ion and l=the lost protons get associated with another water molecule to form hydronium ion.
That would be an endothermic reaction! :)