Complex organic food molecules such as sugars, fats, and proteins are rich sources of energy for cells because much of the energy used to form these molecules is literally stored within the chemical bonds that hold them together. Scientists can measure the amount of energy stored in foods using a device called a bomb calorimeter. With this technique, food is placed inside the calorimeter and heated until it burns. The excess heat released by the reaction is directly proportional to the amount of energy contained in the food.
They're strong and are good at keeping the sea out long-term, however they're really expensive
Answer:
Mantle
Explanation:
The second layer of the earth is just below the crust. It's called the mantle. The mantle is very thick: 1800 miles deep. The mantle is a little bit like a sandwich.
Answer:
Alveoli are tiny balloon-shaped structures. They sit at the ends of the branches of your respiratory tree.
Explanation:
