Answer:
Toothpastes generally contain the following components: Water (20–40%) Abrasives (50%) including aluminum hydroxide, calcium hydrogen phosphates, calcium carbonate, silica and hydroxyapatite. Fluoride (usually 1450 ppm) mainly in the form of sodium fluoride.
Answer:
The first one: Fertile soil for growing crops
The second one: They thought that Lincoln would end slavery
Explanation:
You are right the U.S is in the Northern Hemisphere and the Western Hemisphere.
The answer is: adapt to one's environment.
According to piaget, organisms with low intelligence tend to only recognize low variety way of living and unable to adapt to extreme change in environment. More often than not, this would make such organisms much more likely to extinct.
Intelligent organisms on the other hand, can adapt to extreme changes and had a very high likelihood to survive to the next generation. (humans for example can live in both cold north pole and hot dessert while no other organisms able to live in two completely different climate, indicating how good we are in adapting to our environment)
