This is vitamin D3; it's made in the skin and it's also added to foods to fortify them.  It breaks down if exposed to UV radiation.  The recommended daily dose for people is 600 IU's, but in higher amounts it can be toxic.  It's used as an ingredient in rodent poison; it causes hypercalcemia (high calcium), which leads to kidney failure and death.

     The definition of an animal includes all levels of animals, in other words, anything that's not a plant.  This includes protozoa, crustaceans, insects, amphibians, fish, birds, and mammals.

     Oops; sorry about that!  Tea, pear, cat, and rat. 

    Also, "integral".

     The Milky Way.

      Humidity is the amount of moisture in the air.  Warm air holds much more humidity than cold air, so that's why summers can be humid.

     Carpet

     One inch equals 2.54 centimeters, so however many centimeters you have, divide it by 2.54, and that'll give you inches.

     Freescore.com can get away with this because they do offer you free credit reports from all 3 reporting agencies.  But the problem is that Freescore is a company trying tot make a profit, so they're using these free reports as a hook to get you to subscribe to their service (which they charge you for).  These additional services include a social security report (which the government sends you for free every year 3 months before your birthday), customer service, and a "comprehensive on-line credit learning center". 

    Only the FTC is authorized by law to give you your 3 free credit reports.  Please go to AnnualCreditReport.com.  Good luck!

     It's "robbing Peter to pay Paul".  Supposedly it's a quote from the Bible