IUCN Red List (2004) documents the extinction of A species in the last B years.

Options

A. A- 500, B - 300
B. A -784, B -500
C. A - 654, B - 500
D. A - 984, B -300

Answer

To solve the question regarding the IUCN Red List, we will follow these steps:

### Step 1: Understand the IUCN Red List
The IUCN Red List is a comprehensive inventory of the global conservation status of biological species. It provides information on the extinction risk of various species.

### Step 2: Identify the number of species documented as extinct
According to the IUCN Red List (2004), a total of **784 species** have been documented as extinct.

### Step 3: Determine the time frame for extinction
The IUCN Red List indicates that these extinctions have occurred over the last **500 years**.

### Step 4: Fill in the blanks
Now we can fill in the blanks in the question:
- A = 784 (the number of species documented as extinct)
- B = 500 (the number of years over which these extinctions have occurred)

### Final Answer
Thus, the answer to the question is:
- A = 784
- B = 500