Question

why is biodiversity essential

Answer 1

biodiversity boosts ecosystem productivity where each species, no matter how small, all have an important role to play for egg:- a large number of plant species.

hope this may help you.

thnx..

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Answer 2

Because it is a resource for food, shelter, clothing and other materials. The economy relies on biodiversity since it provides renewable economic resources and ecosystem services, medical and scientific benefits, and is priceless in term of cultural and aesthetic values.
In British Columbia, resources such as timber, minerals, water, fish and game animals, and agricultural products are integral to our economy. 
Medicine relies on biodiversity since most pharmaceutical drugs are derived either directly or indirectly from wild species, mainly plants. However, only about 2 percent of the flowering plants in the world have been studied for their potential pharmacological properties. New discoveries, often in unexpected areas, are ongoing. For example, taxol, an anticancer drug, was discovered in the bark of Pacific Yew trees in BC’s old-growth forests. The Yew was previously regarded as a non-commercial tree that was discarded during forest harvesting. The medicinal properties of biodiversity are important for human health as well as scientific research and the economy.