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Figure 18 – This microscopic image of the
ocean shows many types of plankton,
including those classified as plants,
animals, bacteria, and archaea.

Conclusion

The prokaryotes, bacteria and
archaea represent an amazingly

diverse group of organisms only
visible when one looks under a
microscope. These single-celled
organisms obtain energy and
reproduce in a variety of ways,
although all engage in asexual
reproduction.

Though some bacteria are harmful,
causing disease, many are very
helpful, providing the nitrogen we
need to live and aiding in digestion.
Archaea have been found in some
of the most extreme environments
on the planets, including
environments that are remarkably
hot or salty.

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