Due to the fact that the demand for red blood cells increases during pregnancy, what nutrient is needed regularly?

The correct answer is iron.

Explanation:

Iron is required to produce red blood cells, which transport oxygen all through the body. At the time of pregnancy, one requires more iron as the volume of the blood enhances and the development of baby's blood also takes place.  

In order to include more iron in the diet, one should comprise at least two servings of chicken, meat, legumes, fish, and nuts each day. One should consume cereals, whole-green bread, and green leafy vegetables regularly. In the case of certain women who are not able to get adequate amount of iron from the food, they need to get an iron supplement.  

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.