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Contrary to the initial poster, yes there "can" be. Title 21 of the FDA Code of Regulations section 110.110 sets maximum allowable amounts of contaminants in food. For example in peanut butter 1 or more hairs per 100g is acceptable. While raw wheat can contain 9mg of rat feces per kg of wheat. While this does not prove there is rat hair in food. It does infer that there is as otherwise there would be no need for such regulations.

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What factors govern the distribution of hair on species such as the human or rat?

Genes and hormones govern the distribution of hair on species such as the human or rat. Other animals such as cats have seasonal hair changes due to a change in hormone levels.


Does the fur on a rat and human hair serve a similar purspose?

The rats hair main function is to maintain body temperature, just like the hair on humans reduces loss of heat by radiation. They are different that the hair covers the entire rat, where as it is mostly on the top of the head for humans.


Which area of the rat body is not covered with hair?

Nose, tail and paws.


Shara feeds her rat different brands of rat food brands X Y and Z each for 2 weeks and weighs the rat over several days during the period of each diet What is the independent variable?

The independent variable in this experiment is the type of rat food (brands X, Y, and Z) that Shara feeds to the rat. It is the factor that is intentionally changed or manipulated by the researcher to observe its effect on the dependent variable, which in this case is the weight of the rat.


If your rat is hairless will the hair grow back?

Many rodents such as rats and mice are laboratory-bred hairless animals, deliberately bred so in order to facilitate various testing methods. If your rat is one of these, the hair will not grow back; it is a hairless breed. If your rat was born with hair and has lost it for some reason you will need to consult a vet, since its condition could lead to health problems for your pet.