Instant (rapid) speciation occurs by............. and ...............

Explanation

**Step-by-Step Solution:**

1. **Understanding Speciation**: Speciation is the process through which new species are formed. It can occur gradually over time or rapidly in certain conditions.

2. **Defining Instant (Rapid) Speciation**: Instant or rapid speciation, also known as abrupt speciation, refers to the quick formation of new species, often due to specific mechanisms.

3. **Identifying Mechanisms of Rapid Speciation**: The two primary mechanisms through which instant speciation occurs are:
- **Hybridization**: This is the process where two different species interbreed to produce a hybrid organism. An example is the mule, which is a hybrid of a horse and a donkey.
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