Maple trees should be at least 30+ years old before they are tapped and a 40-year-old sugar maple tree will produce about 10 gallons of sap per season.
An erection is a vascular process where the corpora cavernosa fill with blood, increasing in length and thickness, often initiated by the parasympathetic nervous system.
Black cats are black because of high levels of eumelanin pigment, and the gene that produces it is dominant. A kitten only needs one black gene from a parent to have a black coat.
