The underlined phrase "to decline" is an infinitive. An infinitive is the base form of a verb, often preceded by "to." In this case, "to decline" functions as a noun, representing the action of declining.
Identify the underlined verbal or verbal phrase as a gerund, a participle, or an infinitive.
The number of pygmy hippopotamuses in the wild has started to decline. With the underlined part being "to decline"
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