How is the presently occuring species extinction different from the earlier mass extinctions ?

Explanation

### Step-by-Step Solution:

1. **Understanding Biodiversity and Extinction**:
- Biodiversity refers to the variety of life forms on Earth, including different species of plants, animals, and microorganisms. Extinction is the process where a species completely disappears from Earth.

2. **Historical Context of Mass Extinctions**:
- Throughout Earth's history, there have been five major mass extinction events where a significant number of species were lost rapidly. These events were primarily caused by natural phenomena such as volcanic eruptions, climate changes, and asteroid impacts.

...