A mute is primarily composed of which of the following substances?

The mute is a term used to describe the excretion produced by birds of prey, including falcons, and it consists mainly of uric acid, while also containing some fecal matter and urine. Unlike mammals, birds excrete nitrogenous wastes in the form of uric acid rather than urea, which helps conserve water, as uric acid is less toxic and requires less water for elimination.

Additionally, a portion of the excretion may include fecal matter, which consists of indigestible remnants of the bird's diet, and some liquid waste that could be considered urine. Thus, a mute encompasses a combination of these substances. Therefore, it is accurate to state that a mute consists of fecal matter, urine, and uric acid, validating the option that suggests all of these components are part of a bird's excretory output. This comprehensive understanding highlights the physiological adaptations birds have developed for waste management within their ecological niches.