Which of the following does not occur when we hear a sound? the eustachian tubes constrict the fluid in the cochlea moves sound waves enter the ear canal and strike the eardrum the auditory nerve carries nerve impulses to the brain

Option A, The Eustachian tubes constrict

Explanation:

The Eustachian tubes basically equalizes the pressure in the middle ear whenever our ears are exposed to a varying outside pressure as compared to the pressure inside the ear. This happens very often with people who travel through flight or aqua divers, mountaineers etc. Thus, the role of Eustachian tubes is not very relevant when we are hearing something. It works even when we are not hearing anything.

Hence option A is correct.

protein makes up the building blocks of organs, muscles, skin, hormones and pretty much everything that matters in your body.

some choices are:

peanut butter

seeds

eggs

yogurt

meats

fish

so pretty much meat, dairy, nuts, and grains.

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.