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kifflom [539]
3 years ago
14

In two or more complete sentences describe how a dam placed in a river can act as both a constructive and destructive force.

Biology
2 answers:
FromTheMoon [43]3 years ago
8 0
The good thing about a dam is that electricity can be created by mechanical means. That does not affect the atmosphere. Storing such production is a different matter.

The bad thing about a dam is that it wreaks havoc on the land where the water is stored behind the dam.

vodomira [7]3 years ago
4 0

Answer:

<u>Dams are constructed over the narrow valleys and it acts like a barrier that obstructs the water from the flow</u>. There are both advantages as well as disadvantages in constructing a dam.

Some of the constructive force or advantages of dams are as follows-

1) It generates electricity .

2) It is often used for irrigation and industrial purposes.

3) it is used for farming purposes in water such as raising as well as harvesting of fishes and other aquatic plants.

Some disadvantages are-

1) It degrades water quality.

2) Aquatic organisms are affected thereby harming the ecosystem.

3) It obstructs the flow of water.

4) Failure of a dam causes flood.

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Through which microscope were cells first observed?
poizon [28]

Compound microscope

<h3>Further explanation</h3>

In 1665, Robert Hooke used a compound microscope to observe cells. Hooke observes the cell walls of dead plants (in the form of cork) when they appear under a microscope. He named it the cell because it looked similar to a cellula or small room inhabited by monks.

Development of microscopy:

  • 1590: Hans and Zacharias Janssen, as Dutch lens grinders, mounted two lenses in a tube to produce the first compound microscope.
  • 1660: Robert Hooke published <em>Micrographia</em>, containing detailed observations of biological materials made with the best compound microscope.
  • 1676: Anton van Leeuwenhoek was the first person to observe a live cell under a microscope, i.e., the algae Spirogyra.
  • 1931: Ernst Ruska constructed the first electron microscope. With the invention of the electron microscope, many infectious agents smaller than bacteria could be seen.

Until now, we can see how important the use of microscopes, especially in microbiology, that is the study of microorganisms.

<h3>Learn more</h3>
  1. How was the water filtered to remove debris and living organisms?  brainly.com/question/5646770
  2. About the single bonds in fatty acids brainly.com/question/1386856
  3. The theoretical density of platinum which has the FCC crystal structure. brainly.com/question/5048216

Keywords: compound microscope, Robert Hooke, cells first observed, cork, dead plant, walls, Anton van Leeuwenhoek

3 0
3 years ago
Read 2 more answers
Which organism is an example of a producer?
melisa1 [442]
“Producers are any kind of green plant. Green plants make their food by taking sunlight and using the energy to make sugar. The plant uses this sugar, also called glucose to make many things, such as wood, leaves, roots, and bark. Trees, such as they mighty Oak, and the grand American Beech, are examples of producers.” -Virginia Tech
I hope this helped.
5 0
3 years ago
Read 2 more answers
Which of the following birds did NOT live in the Paleocene epoch ?
forsale [732]

Answer: None of the above

Explanation:

7 0
3 years ago
Both mitosis and meiosis begin with a diploid cell that contains replicated chromosomes. What are the main differences between t
just olya [345]

Answer:

Hope this helps :)

Explanation:

Mitosis is the process by which cells duplicate.

Meiosis is a similar process which is just used to make reproductive cells such as eggs or sperm.

In mitosis, the cell DNA arranges into 46 chromosomes, duplicates, and then divides into two new cells.

In meiosis, the same duplication occurrs except four cells are created, each with only 23 chromosomes. (You know how you get half of them from each parent? This is so that the offspring have genetic variation.)

Another thing to notice about meiosis is that the cells are not identical like in mitosis, which simply duplicates them. Furthermore, in males all four sex cells are used as sperm but in females only one of these cells develops into an egg whereas the rest, called polar bodies, are reabsorbed into the body.

3 0
3 years ago
Which for the following are true statements about Autosomal Recessive Disorders
EastWind [94]

Explanation:

If you want 100% true statements, try searching this in biographys. I'm too lazy though so here's something from the internet mate.

Answer:

The most common conditions that are caused by an autosomal recessive gene mutation are cystic fibrosis, thalassaemia, haemochromatosis and Tay Sachs disease. Figure 7.7: Autosomal recessive inheritance when both parents are affected or predisposed to develop the condifion.

3 0
3 years ago
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