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.
Golden Key is an internationally recognised, non-profit organization affiliated with over 370 universities throughout Canada, Australia, New Zealand, Malaysia, South Africa, India and the United States. Membership into Golden Key is by invitation only, to the top 15% of university students.olden Key is an internationally recognised, non-profit organization affiliated with over 370 universities throughout Canada, Australia, New Zealand, Malaysia, South Africa, India and the United States. Membership into Golden Key is by invitation only, to the top 15% of university students.