Mammal I’m not sure sorryyyy
"The density of a substance determines how much light is refracted"
Hope this helps :)
Lipids, also known as fats, play multiple roles in the body. Fats are broken down in the digestive tract to form individual fatty acids and cholesterol molecules. <span>Carbohydrates are the preferred source of energy for most of the tissues in the body, including the nervous system and the heart</span>
Both are hard structures that reduce erosion causes by waves.
