Question

in spring, when the bear merge from their dens, they have lost between 15% and 30% of their body weight (mass)—that could be around 120 pounds for a large brown bear! considering your model, where did all the mass go when it was \lost.\ a fats are carried to the stomach to be digested and make heat to help the bear survive. b the bear’s stored fats are burned using oxygen it breathes in and is lost as carbon dioxide and water the bear breathes out.

Explanation:

To determine the correct option, we analyze the process of fat metabolism in brown bears. When fats are burned (metabolized) for energy, they react with oxygen (from breathing) to produce carbon dioxide, water, and energy (heat). Option B describes this: stored fats are burned using oxygen from breathing, and the by - products (carbon dioxide and water) are exhaled or eliminated. Option A is incorrect as fats are not carried to the stomach for digestion in the context of mass loss during hibernation - related fat burning; rather, stored fat (in adipose tissue) is metabolized for energy.

Answer:

B. The bear's stored fats are burned using oxygen it breathes in and is lost as carbon dioxide and water the bear breathes out.