The more commonly used light-year is also presently defined to be equal to precisely 7007315576000000000â 31557600 light-seconds, since the definition of a year is based on a Julian year (not Gregorian year) of exactly 365.25 days, each of exactly 7004864000000000000â 86400 SI seconds.
Keystone resource a component of the environment utilized by individuals in the ecological community without which the individuals would not thrive or without which the ecological community structure would be negatively effected. Kin selection
About KXL. The Keystone XL (KXL) Project is a proposed 36-inch-diameter crude oil pipeline, beginning in Hardisty, Alberta, and extending south to Steele City, Nebraska. This pipeline is a critical infrastructure project for the economic strength and energy security of the United States.