Final answer:
The concept of 'unity in diversity' in biology is supported by the universal structure of DNA, the nearly universal genetic code, and the similar basic structure of mammalian forelimbs, all of which highlight the common ancestry of diverse life forms.
Step-by-step explanation:
The concept of "unity in diversity" in biology refers to the idea that all living organisms, despite their vast diversity, share certain fundamental characteristics that point to a common ancestry. This concept is exemplified by several key features:
- The structure of DNA is the same in all organisms, indicating a commonality in the genetic framework that underpins life.
- Genetic code is nearly universal across various life forms, meaning that from bacteria to humans, the instructions within DNA are read and translated in very similar ways.
- The basic structure of forelimbs in mammals is also an example of unity in diversity, as the same set of bones are repurposed and modified in different species to suit their distinct living conditions and evolutionary paths.
When considering these points, the statement that includes all the examples: 'The structure of DNA is the same in all organisms,' 'All organisms, including prokaryotes and eukaryotes, use essentially the same genetic code,' and 'The forelimbs of all mammals have the same basic structure, modified for different environments,' proves to be the correct answer illustrating unity in diversity.