Type your answer on the lines below, or write it out on paper.
Biologists recognise two main types of speciation, summarised in the table.
| Feature | Type 1 | Type 2 |
|---|---|---|
| Populations separated by a geographical barrier | Yes | No |
| Populations live in the same area | No | Yes |
Identify which type in the table is allopatric speciation and which is sympatric speciation.
Explain what both types of speciation must have in common for new species to form.