What is the term for the several times in the Earth's history when biodiversity (i.e.,number of genera) has rapidly decreased worldwide? 
Definitions:
Diversity
The inclusion of individuals with a range of characteristics, such as age, gender, ethnicity, religion, disability, sexual orientation, education, and national origin, contributing to a rich variety of experiences and perspectives.
Experimentation With Failure
The process of actively engaging in trials that may not succeed in order to learn, innovate, or solve problems.
Group Size
refers to the number of individuals forming a group, affecting dynamics such as participation, cohesion, and effectiveness.
Paranoia
A psychological state marked by false beliefs of being persecuted, undue suspicion, or an inflated sense of one's own significance, often developed into a structured belief system.
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