Concept explainers
To explain:
The phenomenon of regeneration complicates the definition of what constitutes an “animal” versus single celled life forms.
Introduction:
The potential of regeneration in certain animals is exhibited by some organs such as hydra. It can regenerate its lost body parts or even entire body and a salamander can regenerate its lost limb. As the evolution progresses, the potential of regeneration in some species will be lost such as in higher organisms like humans. This is so because; they do not posses regeneration potential.

Explanation of Solution
Animals are defined as multicellular organism that has complex organs and organ system such as muscular tissue, nervous tissue and so on. All of these systems work in a coordinated fashion under the control of the “nervous system”. Complete regeneration (reproduction) of an animal is a complex process.
A bacterium (single celled life form) can regulate its
Hydras and sponges have genes and special molecular mechanisms which allow them to regenerate, but such molecular mechanisms are not present in the higher eukaryotes like animals. The presence of such complex mechanisms makes the given definition complicated.
The presence of complex structure and mechanisms are making the given definition intricate.
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Chapter 31 Solutions
CELL AND DNA CUSTOM UPDATED 2015
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