Multiple choice

The basic unit of classification is:

  1. phylum

  2. class

  3. order

  4. species
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Species is the fundamental unit of biological classification - a group of organisms that can interbreed and produce fertile offspring under natural conditions. Higher categories like genus, family, order, class, and phylum are built upon this basic unit.

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