Explanation:
Iron has many uses but as far its chemical properties and the given options are concerned, following uses of iron are due to its chemical properties:
* When iron is put into fire, it produces sparks which are colored, which are not produced by mostly metals. Its purely because of the chemical properties it possess.
* When iron is placed in the water and oxygen, it rusts. When we place iron outside in the open air, when it is thrown some water, after few days you will see that iron has started rusting. This process is purely depends on the iron's chemical properties.
<span>The contact hypothesis has been described as one of the best ways to improve relations among groups that are experiencing conflict. Gordon W. Allport (1954) is often credited with the development of the contact hypothesis, also known as Intergroup Contact Theory.
When jenny's parents told her that they were moving to alabama, she was horrified because she secretly thought that southerners were mostly poorly educated and racist. after experiencing the foods, traditions, and people in her new state, she was surprised to realize that southerners weren't all alike, and that many of her new friends were just like her. this is an example of: the contact hypothesis.</span>
Answer:
I answer should be a.......
The main reason for migration is mostly food: people migrate where they can produce food easily, catch it, or in modern times, to produce money to buy food.
Other reasons is conflict with other people and competition for food: people migrate in the hope that elsewhere they won't have to compete.
Finally, people might also migrate to look for a better climate (where they don't have to built very cold resistible houses for example).
