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Alex73 [517]
2 years ago
8

What is a possible reason for extinction?

Biology
1 answer:
Taya2010 [7]2 years ago
7 0

Answer:

The number of habitats falls below a critical level.

Explanation:

The possible reason for extinction is that the number of habitats falls below a critical level. This makes it impossible for organisms to survive.

  • A habitat is the dwelling place of living organism in an ecosystem.
  • The resources and other materials that ensures the survival of an organism are made available in the habitat.
  • When a habitat begins to thin out and can no longer support organisms, then extinction will ensue.  
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The advantage of having many nuclei in a skeletal muscle fiber is:
HACTEHA [7]

Answer:

Option (D).

Explanation:

Skeletal muscles is one of the most important types of muscle that regulate the contraction of skeletal muscles of the body. The skeletal muscle is controlled by the somatic nervous system.

Skeletal muscles are multi nucleate contains large number of nucleus in their structure. The multiple nucleus increases the ability of muscle to produce large number of enzymes. These enzymes are proteins are important for the muscle contraction.

Thus, the correct answer is option (D).

6 0
3 years ago
List the conditions necessary to provide food for a large population.
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Answer:

<u><em>The necessary condition are the following:</em></u>

1) One should have enough money to buy the food.

2) One should have enough crops.

3) The distribution of food must be equal.

4) The economy should be high

5) The management should be proper.

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What do free living bacteria in the soil do?
elena55 [62]

Answer:

Nitrogen-fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds usable by plants). More than 90 percent of all nitrogen fixation is effected by these organisms, which thus play an important role in the nitrogen cycle.

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6 0
3 years ago
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Describe what happens during transcription
Verdich [7]
Transcription is when DNA segments are copied into RNA. 
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2. RNA Polymerase breaks all the hydrogen bonds between the two stands of DNA
3. RNA Polymerase create the pair strand for one of the DNA strands (Uracil instead of Thymine!)
4. Hydrogen bonds break between the DNA strand and RNA strand
5. DNA is zipped back up and RNA either floats around in the Nucleus (if there is one) or exists through a pore
8 0
3 years ago
From where do the placenta and umbilical cord develop?
Katen [24]

Answer:

The correct answer is ''outer cells of the blastocyst'' The placenta and umbilical cord will derive from the trophoblast and from the internal cell mass all the tissues that will form the embryo.

Explanation:

The umbilical cord and the placenta are two fundamental organs for the development of the fetus, both come from the same initial cell as the fetus and for this reason they share a lot of genetic information with it. The placenta joins the wall of the uterus which is where the umbilical cord arises. As a general rule, it is attached to the upper, lateral, anterior or posterior part of the uterus. In some rare cases, the placenta can join the lower uterus, causing what is called placenta previa. The placenta begins to form at the same time that the fertilized ovum implants in the wall of the uterus and is essential for the correct development of the embryo, since it is through it and the umbilical cord to which it is subject that the fetus maintains the connection with the mother and receives all the nutrients it needs, in addition to the blood and oxygen it needs to breathe. The outer part of the placenta comes from the transformation of the uterus mucosa, while the inner part, called trophoblast, is configured from the embryo's own blasts, establishing a complex network of blood vessels, through which the fetus you will receive the nutrients you need. Also from the trophoblast, the chorionic plate is formed, in which the chorionic villi are located, which allow the embryo to attach to the wall of the uterus.

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