....... P ......... represent one of the best examples of Adaptive radiation . Another example is ....... Q........A number of .....Q..... , each different from the other evolved from an ancestral stock , but all within the Australian island continent . When more then one adaptive radiation appeared to have occurred in an isolated geographical area ( representing different habitats ) , one can call this ..... R.........

Options

A. `{:(P,Q,R),("Australian","Darwin's","Convergent"),("placentals","finches","evolution"):}`
B. `{:(P,Q,R),("Darwin's","Australian","Convergent"),("finches","placentals","evolution"):}`
C. `{:(P,Q,R),("Australian","Darwin's","Divergent"),("finches","placentals","evolution"):}`
D. `{:(P,Q,R),("Darwin's","Australian","Divergent"),("finches","placentals","evolution"):}`

Answer

To solve the question, we need to identify the best examples of adaptive radiation and the terms related to it. Let's break it down step by step.

### Step 1: Identify the best example of adaptive radiation (P)
Adaptive radiation refers to the rapid evolution of different species from a common ancestor, typically when they adapt to different environments. One of the most famous examples of adaptive radiation is the **Darwin's finches**.

**Hint for Step 1:** Think about species that evolved from a common ancestor in response to different environmental pressures.

### Step 2: Identify another example of adaptive radiation (Q)
In the context of Australia, another significant example of adaptive radiation is the **Australian marsupials** (placentals). These species evolved from a common ancestor and adapted to various niches within the Australian continent.

**Hint for Step 2:** Consider species that have diversified in a specific geographical area, particularly in Australia.

### Step 3: Define the term for multiple adaptive radiations in an isolated area (R)
When multiple adaptive radiations occur in an isolated geographical area, it is referred to as **convergent evolution**. This term describes the process where different species evolve similar traits independently, often due to similar environmental pressures.

**Hint for Step 3:** Look for a term that describes the phenomenon of different species developing similar traits in response to similar environments.

### Final Answer
So, putting it all together:
- P: Darwin's finches
- Q: Australian marsupials
- R: Convergent evolution

### Complete Statement
Darwin's finches represent one of the best examples of adaptive radiation. Another example is Australian marsupials. A number of Australian marsupials, each different from the other, evolved from an ancestral stock, but all within the Australian island continent. When more than one adaptive radiation appeared to have occurred in an isolated geographical area (representing different habitats), one can call this convergent evolution.