Can recognize themselves in a mirror.
Answer:
1. The Nile River
2. The Sahara Desert
3. The Red sea.
4. The Mediterranean Sea.
Explanation:
1. The Nile River: a natural source of fresh water that provided fertile soil for farming. The Nile’s water is a body of water known as River Nile. It has its source from Burundi and flows through the North-Eastern part of Africa, Egypt precisely and it flows for over 4,132 miles (about 6,650km) before draining into the Mediterranean sea. River Nile is considered to be the longest river in the world and comprises of white nile and blue nile.
2. The Sahara Desert: a large stretch of dry land that made Egypt difficult to invade from the west. Sahel refers to a semi-arid region of land that is strategically positioned to south of the Sahara Desert and it is typically made up of barren planes with very few trees and dry area of grasses.
3. The Red sea: a body of water east of Egypt that allowed ancient Egyptians to trade with Asia.
4. The Mediterranean Sea: a large body of water that allowed for trade with coastal cities in Asian and Europe.
A way to prevent spoilage of unsaturated fats and make them solid at room temperature is to change their fatty acids chemically through: Hydrogenation.
- Hydrogenation is a chemical reaction between molecular hydrogen and another compound or element, usually in the presence of a catalyst such as nickel, palladium or platinum. The process is commonly employed to reduce or saturate organic compounds.
- Hydrogenation reactions are extensively used to create commercial goods.
- Hydrogenation is used in the food industry to make a large variety of manufactured goods, like spreads and shortenings, from liquid oils. This process also increases the chemical stability of products and yields semi-solid products like margarine.
- Hydrogenation is also used in coal processing. Solid coal is converted to a liquid through the addition of hydrogen. Liquefying coal makes it available to be used as fuel.
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