Which major wildlife conservation organization pioneered the 'adoption certificate' retail model in the 1970s, revolutionizing how people could symbolically adopt endangered animals?

Test your knowledge about innovative retail strategies in the wildlife conservation sector! Many organizations are transforming how they sell merchandise and experiences to support animal conservation efforts. From wildlife adoption packages to eco-friendly product packaging, the retail side of wildlife conservation has evolved significantly. This question focuses on a groundbreaking retail approach that changed how consumers support endangered species.

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World Wildlife Fund (WWF)
National Wildlife Federation
The Nature Conservancy
Defenders of Wildlife