The external intercostals elevate the rib cage during

Inhalation

Explanation:

The intercostal muscles consists of three sets of superimposed muscles located between adjacent ribs. These sets of muscles is made up of the external intercostal, internal intercostal, and innermost intercostal muscles.

The external intercostal muscles are involved in inhalation,and the elevate the rib during this process.

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

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