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vekshin1
2 years ago
12

Which of the following is a clue of a chemical change?

Biology
1 answer:
nikdorinn [45]2 years ago
3 0

The changing of the colors of the iron when it is heated is an example of the physical change. When the iron is heated, the electrons gets excited and move to higher energy shells.

The formation of the gas bubbles in the boiling water is also an example of the physical change as no chemical reaction has taken place.

When the melted wax is poured into ice, the melted wax is formed. This is also an example of physical change, as just the state of the wax has changed.

When vinegar and baking soda are mixed, a chemical reaction takes place, which leads to the formation of the carbon-dioxide gas. This is an example of chemical change.

Hence, the answer is 'option D'.


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After removing 30 of 40 insects from the population of five different colors, the ten that are left come in only two colors, red
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Answer:

the bottleneck effect

Explanation:

Based on the information provided within the question it can be said that this is an example of the bottleneck effect. This term refers to the loss of a specific amount of diversity within a population during some event, in which the surviving members only survived by complete luck and would replay the same way. This is what happened with the loss of all the other colored insects except for red and blue.

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<span>Water evaporates into the atmosphere through the means of transpiration. As the water evaporates, it tends to pull more water molecules up along the xylem. This is known as transpiration pull, where because of surface tension of water and capillary action, water is pulled up along the xylem due to transpiration. This is not the only mechanism of water movement in plants however. </span>

<span>Anyways, from the example of transpiration pull, you can see the role of water potential as the water potential in the soil, being high, flows through the plant, and into the air.</span>
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Explanation:

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