Answer:
Meat is the only nutritionally complete food. Animal foods (particularly when organ meats are included) contain all of the protein, fat, vitamins and minerals that humans need to function.
Ingredients in processed meat:
A typical ingredient statement might list "beef, pork, water, hydrolyzed vegetable protein, salt, dextrose, corn syrup, hydrolyzed milk protein, sodium phosphate, natural spices, smoke flavoring, sodium erythorbate, sodium nitrite."
Explanation:
Lichen is the best species to determine the pollution of air. They are highly sensitive to pollution and will barely be found growing on trees or rock in regions where the air has been polluted.
Worms are also a good indicators of pollution in the soil. Polluted soils will have very few to no worms.
Small invertebrates like the Caddisfly are used to determine pollution of water. They are very sensitive to water pollution and cannot be found in polluted waters. In addition toads and frogs are rare in polluted waters and air.
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Answer: homeostasis.
Homeostasis is the regulation of the functions of some internal conditions as reaction to changes in the environment.
For example, although the external temparuture changes the matabolism is capable to keep the temperauture of the body constants through homeostasis.
That does not happen with the cold blooded animals. If you put a small frog very close to a hot ligthed bulb, its blood will not be able to keep it cool and it will dry completely.
The answer is Artificial selection
