The red fox (Vulpes vulpes)enters estrus for a single 1- to 6-day period each year and ovulates once.This implies that

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Since the red fox only enters estrus for a single period each year and ovulates once, it is likely that the female only gives birth to one litter of kits each year. Option A is not applicable since there is no evidence of delayed implantation in red foxes. Option C is not necessarily true, as foxes can be polygamous with multiple sexual partners. Option D is not applicable since semelparity refers to organisms that only reproduce once in their lifetime, while the red fox reproduces annually. Option E is not necessarily true, as the female may not find another mate if her embryos abort prior to birth.

The Red Fox (Vulpes Vulpes)enters Estrus for a Single 1-