How would u approach the first one, #54
<span>Lipids insulate against the cold.
Fat is our natural coat produced by the over eating process. Not really sure, but it comes to mind that the layer under the skin can be the main reason for it as it prevents and keep our inner parts warm. Also the high blood flow that it demands can help by over circulating it.</span>
True, though the Hadean period is one exception.
The frequency of the waves must decrease when the musician increases the wavelength without changing their speed. Your welcome
A sudden inrush of water could over whelm animals and possibly kill them if the water is of a different type.