There are about __ known species of vertebrates out of the 1.9 million identified species. a 1 million b 580,000 c 18,000 d 58,0 oo

## Step 1<br />The problem is asking for the number of known species of vertebrates out of the 1.9 million identified species. Vertebrates are animals that have a backbone or spinal column. This includes a wide variety of animals such as mammals, birds, reptiles, amphibians, and fish.<br />## Step 2<br />The options provided are: 1 million, 580,000, 18,000, and 58,000. The correct answer is 58,000, which corresponds to option D.