Which of the following serve as antibodies? carbohydrates lipids proteins nucleic acids

Protein

Explanation:

Out of the four macromolecules, proteins are the ones that serve as antibodies.

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answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.