if this is your question The mixing of plants, animals, and microorganisms that occurred after Europeans arrived in the Americas is known as A. the Columbian Exchange. B. global interdependence. C. triangular trade. D. global mixing.<span>The mixing of plants, animals, and microorganisms that occurred after Europeans arrived in the Americas is known as the Columbian Exchange. </span>
Marie Curie studied the radiation of all compounds containing the known radioactive elements, including uranium and thorium, which she later discovered was also radioactive. She also found out that:
- you can exactly measure the strength of the radiation from uranium;
- the intensity of the radiation is proportional to the amount of uranium or thorium in the compound - no matter what compound it is;
- the ability to emit radiation does not depend on the arrangement of the atoms in a molecule; it must be linked to the interior of the atom itself - a revolutionary discovery!
When she realized that some uranium and/or thorium compounds had stronger radiation than uranium, she made the following hypothesis: there must be an unknown element in the compound which had a stronger radiation than uranium or thorium. Her work aroused the interest of her husband, Pierre Curie, who stopped his own research on crystals and joined the "detective work" with his wife. And Marie was proven right: in 1898 the Curies discovered two new radioactive elements: radium (named after the Latin word for ray) and polonium (named after Marie's home country, Poland).
Colonial women were mainly responsible for household duties.
The correct answer to this open question is the following.
Although there are no options attached to further context or reference, we can say the following.
The characteristics of civilization are they have cities, a form of government, the presence of religions, solid culture and art, defined social structures, record keeping of time and events, education, and the presence of certain kinds of technology that allows the civilization to prosper.
The turn of civilizations can be problematic in that the evolution of man and its social structures is not an easy task to accomplish because humans have different interests regarding politics, and power. These interests sometimes clash with each other and problems arise. There are many different versions of what is good for civilization.
The oldest civilization on earth, according to historians, is Sumeria. This civilization settled in between the Tigris and Euphrates Rivers in the Middle East region, modern-day Iraq.
