Reituki. I am sure about this one
Answer:
Gestational age may be overestimated by up to six weeks by assuming that the fundus reaches the umbilicus or that fetal heart tones appear at 20 weeks. However, carefully derived obstetric estimates potentially may be more reliable than pediatric estimates.
Cooling, freezing, fermentation, sun-drying, etc., are few age-old food preservation techniques. With the advent of technology, modern methods of food preservation were developed. Chemicals and other natural substances were used for preservation. These substances are known as preservatives.
Adding preservatives is the chemical method of food preservation. Conventional antimicrobial preservatives include <em>calcium propionate</em>, <em>sodium nitrite</em>, <em>sodium nitrate</em>, <em>sulphites</em> (<em>sulfur dioxidepotassium hydrogen sulfite</em>, <em>sodium bisulfite</em>, etc.) and <em>disodium EDTA</em>. <em>BHA </em>and <em>BHT </em>are antioxidants.
