Which of these is a characteristic of a monocot plant

Monocotyledons are vascular plants which produce seeds that develop from flowers and are enclosed in fruits. They have at least three of the following: Flower parts are in 3's or multiples of 3; Leaves are parallel-veined; Vascular bundles are scattered throughout the cross section of the stem; Seeds possess one seed leaf (cotyledon). Secondary growth from a vascular cambium is absent and Pollen grains have one opening.  Examples Include grasses, lilies, greenbriars, palms, yuccas, and sedges.

Ecological footprint is determined by measuring carbon dioxide emissions for a given region.