Cell culture
symbiosis occurs naturally because they were built to be helpful, harmless, or a harm to an animal.
A certain amount of sunlight is healthy for all animals. Too much sunlight, without water, can be extremely dangerous or even fatal.
I think maybee Ants (:
Clown or Nemo fish.
All medication has been animal tested...
gorilla helpfull are harmfull
The point of reprimand is when an animal is scolded for a negative behavior. This is a common technique used in training animals.
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horses
An invertebrate is an animal without a backbone.
The smartest animal without a backbone will have to be an octopus
It depends on the animal. Some are more difficult than others to tell by looking. If you can tell us which animal we can be more helpful.