Question

animals store most of their excess energy reserves as ____, and this is explained because _______.
a glucose; it is easy to break down.
b fat; they store twice as much energy per gram.
c protein; it is a compact source of energy in their bodies.
d carbohydrates; they store twice as much energy per gram of glucose.

Explanation:

Fats are a highly efficient energy - storage molecule in animals. They store approximately twice as much energy per gram compared to carbohydrates like glucose. Glucose is a readily - available energy source but not the main form of long - term energy storage. Proteins are mainly for building and repairing tissues, not the primary energy reserve. Carbohydrates do not store twice as much energy per gram as glucose.

Answer:

B. fat; they store twice as much energy per gram.