The definition of symbiosis has varied among scientists. Some believe symbiosis should only refer to persistent mutualisms, while others believe it should apply to any type of persistent biological interaction (i.e. mutualistic, commensalistic, or parasitic).
The Golden Pledge, which is a System Plus Warranty with a 20 year leak guarantee, can pay for itself within the first ten years, sometimes many times over. The System Plus transforms the normal warranty by removing the small print.
1 : a pledge to pay another's debt or to perform another's duty in case of the other's default or inadequate performance â compare letter of credit. 2 : guarantee 3. 3 : guarantor. 4 : something given as security : pledge. 5 : the protection of a right afforded by legal provision (as in a constitution)