Answer:
Homeostasis is the regulation of bodily functions to stay within a certain range.
Common examples of this would be if you place your hand in extremely warm or cold water, and an immediate response of pulling out of the water or any fluid, is an example of this extreme response, other responses are what is done in everyday, like being thirsty or hungry etc.
These behaviours are shared by all organisms even the most simple ones.
A frog whose skin looks like the environment in which it lives
I think the answer is 90%. According to the recent National institute of Health, Microbes in the human body estimates that 90% of the cells in human body are bacterial, fungal, or otherwise non-human. Despite the arguments that bacteria enjoys a commensal relationship with the humans hosts, only a fraction of the human microbia has been characterized.
You need to recognize that the higher on the food chain, the fewer the number of organisms that occupy that level. This is because of the energy that is available from one level to the next has to decrease since it is used for life's processes.
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