Which of the following factors contribute(s) to species diversity observed at a particular point in time?

A) extinctions
B) originations
C) initial diversity
D) all of the above

Species Diversity

The variety and variability of species within a specific region, ecosystem, or the planet, often used as a measure of the health and complexity of ecological systems.

Originations

The point or process where something begins or is created, often used in the context of biological species or evolutionary developments.

Extinctions

The end of an organism or group of organisms, typically a species, resulting in its disappearance from the Earth.