Exotic spcies are also called
I. introduced species
II. Alien species
III. Non-indigenous species
IV. Non-native species
Choose the correct combination

Options

A. I,II and III
B. II,III and IV
C. I,III and IV
D. I,II,III and IV

Answer

To answer the question about what exotic species are also called, we can analyze the options provided:

1. **Introduced species**: Exotic species are often referred to as introduced species because they are not native to the ecosystem in which they are found; they have been brought in from other areas.

2. **Alien species**: This term is commonly used to describe species that have been introduced to a new environment, making them alien to that ecosystem.

3. **Non-indigenous species**: This term also applies to exotic species, as it refers to species that are not originally from the area they inhabit.

4. **Non-native species**: Similar to the previous terms, non-native species are those that have been introduced to an area where they do not naturally occur.

Now, let's summarize the correct combination of terms that refer to exotic species:

- All four options (I, II, III, IV) correctly describe exotic species.

Thus, the correct answer is **I, II, III, IV**.

### Step-by-Step Solution:
1. **Identify the definitions**: Understand what exotic species are and how they are classified.
2. **Analyze each option**: Check if each term (introduced, alien, non-indigenous, non-native) correctly describes exotic species.
3. **Confirm all terms apply**: Verify that all four options are valid descriptors for exotic species.
4. **Select the correct combination**: Since all four options are correct, choose I, II, III, IV.