Carbohydrates and lipids have many carbon-hydrogen bonds; therefore, they both

store energy in these bonds.
are easily dissolved in water.
dissolve only in vinegar.
exist only in cells of plants.

Carbohydrates and lipids both store energy in their carbon-hydrogen bonds.

The correct answer is: store energy in these bonds.

Carbohydrates and lipids are organic compounds that contain carbon, hydrogen, and oxygen atoms. Both carbohydrates and lipids are composed of long chains of carbon atoms with hydrogen atoms attached to them. These carbon-hydrogen bonds are relatively high in energy.

This high energy content allows carbohydrates and lipids to serve as a storage form of energy in living organisms. When these bonds are broken through chemical reactions, such as digestion or cellular respiration, the stored energy is released and can be used by cells to perform various functions.

Option B, "are easily dissolved in water," is not necessarily true for lipids. While carbohydrates are soluble in water due to the presence of hydroxyl groups (-OH), lipids are nonpolar molecules and are generally insoluble in water.

Option C, "dissolve only in vinegar," is not accurate. Vinegar is an acidic solution primarily composed of acetic acid and water, and it does not have a specific and exclusive ability to dissolve carbohydrates and lipids.

Option D, "exist only in cells of plants," is incorrect. While carbohydrates and lipids are commonly found in plant cells, they also exist in cells of animals and other organisms. These molecules play fundamental roles in energy storage and structure in all living organisms.

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