Down feathers provide a an insulating layer next to the skin of adult birds and cover the bodies of young birds. Endotherm maintain a constant body temperature.
what is the difference between cut- in and cut -out
The difference between the depression and a recession is a recession is the down on an up and down rollercoaster. While the depression, there was no way to tell when it would end.
The alternatives are not real down but a synthetic and normaly hypoalergenic.
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They know how many went down on the Titanic
the difference between weathering & erosion is quite simple weathering breaks down and erosion carries it away like a blow dryer
the difference between a dynasty and government is that in a dynasty the leadership is passed down from the king to the oldest son. In the government you're elected into office.
Cross filling removes material and draw filing smooths it down
A hill is hard to get up and a pill is hard to get down
it speeds up and speeds down
A counter counts up, a timer couts down.