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3 years ago

3 Earth Science questions-

2 answers:

6 0

<span><span>1) buy land and build hotels to attract tourists</span><span>2) migrate to inland areas in search of better jobs</span><span>3) prevent recreational activities on beaches to conserve ecosystem</span><span>4) install wave power plants to produce environment friendly energy</span></span>Save<span>
</span>

den301095 [7]3 years ago

3 0

1:B
2:B
3: Swim at the beaches and visit the recreation facilities.

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Animals that chang greatly from the juvenile to the adult phase of life are said to undergo what?

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2 years ago

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2 years ago

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In the alveolus pictured above, a disease or

Inessa [10]

<h2><u>Full Question:</u></h2>

In the alveolus pictured above, a disease or injury to which structures would reduce the ability of oxygen to diffuse from the alveolar space to the capillary?

A. A and B

B. B and C

C. B and D

D. A and D

<h2><u>Answer:</u></h2>

The correct answer is option D.

<h3><u>Explanation:</u></h3>

Alveoli is defined as the unicellular thickened sac like structure of lungs which helps in exchange of gases in lungs. The exchange membrane of lungs comprise of three structures -

A. The epithelium cells of Alveoli,

B. The basement membrane of alveolar epithelium,

C. The endothelial layer of blood capillary.

The red blood cells described here won't cause any problems to the diffusion of gases from alveolar cavity to blood. The structures mentioned here as the type 2 cells of Alveoli which secrete lecithin, a surfactant which releases the surface tension of Alveoli. This compound prevents the Alveoli from collapsing and helps in diffusion of gases. The other structure mentioned here as D are the alveolar epithelium which is the unicellular thickened membrane of Alveoli, helping in gaseous exchange.

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2 years ago

In a punnett square a capital letter stands for a ___allelle

romanna [79]

In a punnett square a capital letter stand for a <u><em>dominant</em></u> allelle.

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2 years ago

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How does gel electrophoresis work? Group of answer choices DNA is negatively charged. When an electrical current is passed throu

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Answer:

DNA is negatively charged. When an electrical current is passed through a gel, the DNA is repelled by the nearby negative current and pushed across the gel towards the positively charged side.

Explanation:

Electrophoresis has become a standard molecular biology technique. This technique is based on the use of a constant-uniform electric field that enables the separation and identification of DNA fragments with different lengths, which form bands in the electrophoresis gel. Electrophoresis can be used to analyze not only DNA, but also RNA and proteins. During electrophoresis, the fragments of DNA that are negatively charged will migrate towards the positively charged electrode, where the duration of this movement will depend on the size of the DNA fragment, as well as of the pore size in the gel.

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3 years ago