Biology

The correct answer is: B.Species

Species is the most basic and specific level of classification in biology. It refers to a group of organisms that can interbreed and produce fertile offspring in natural conditions. In the hierarchical system of classification, species is the lowest (or most specific) level, and organisms within a species are very similar to each other.

Here's a breakdown of the other options:

A.Genus: This is one level above species. A genus includes one or more species that are closely related. For example, Homo is the genus for humans, and Panthera ...