Consider the following facts:

1. The term biological diversity was first used by wildlife scientist and conservationist Raymond F. Dasmann.
2. It is estimated that only half of the species which existed on Earth are extant today.

Which of the above statements is/are true?

The term biological diversity was first used by wildlife scientist and conservationist Raymond F. Dasmann in the 1968 lay book 'A Different Kind of Country' advocating conservation. The term was widely adopted only after more than a decade, when in the 1980s it came into common usage in science and environmental policy. Rapid environmental changes typically cause mass extinctions. One estimate is that less than 1% of the species that have existed on Earth are extant. A variation of this estimate pegs the percentage of extant species to 2%.