# 1. Carbohydrates
# 2. Lipids
# 3. Proteins and Amino Acids
# 4. Isoprenoids and Pigments
Answer:
Green plants are called producers because they manufacture their own food with the aid of photosynthesis.
A. It generally releases more heat than nuclear fission.
I think the correct answer from the choices listed above is the third option. The barrel of a gun is also known as bore. The barrel is the metal tube which the bullet is fired and the bore is the inside of the barrel. It is the one closest to the barrel so it must be the answer.
