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.
The Negative Pledge. Banks have traditionally used a device known as the negative pledge (âNegative Pledgeâ) in lending documents. The Negative Pledge is an agreement whereby a borrower-pledgor promises a lender not to place a lien on pledgorâs property.