https://sites.google.com/view/env***/lab/module-library/remote-learning-activities/spider-diversity?authuser=0
https://www.amnh.org/content/download/198842/2958216/file/Gibbs%20et%20al.%20What%20is%20Biodiversity.%20Lessons%20in%20Conservation,%20Volume%208,%20Issue%201.pdf
Sample Solution