Answer:
Formaldehyde can be added as a preservative to food, but it can also be produced as the result of cooking and smoking. Formaldehyde also occurs naturally in the environment. Humans and most other living organisms make small amounts as part of normal metabolic processes. Formaldehyde is also a byproduct of combustion. When burning natural gas, kerosene, gasoline, wood, or tobacco, formaldehyde is produced. Automobile exhaust is a common source of formaldehyde in our environment. Tobacco smoking in the home is another source of the chemical in the indoor environment.
Explanation:
Answer:
the great bath was made watertight with the layer of bitumen
In both cases, neither the French nor the Germans succeeded. Due to lack of supplies, harsh weather conditions, and being in unfamiliar territory, both the French and the Germans were vulnerable to counterattack by the Russians, and eventually defeated.
