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azamat
4 years ago
10

Varicose veins seen in the superficial veins of the legs are unsightly and are often treated by surgical removal. However, even

without these veins being present, the return of all blood toward the heart from the legs is not diminished. This is primarily because ______.
Biology
1 answer:
miss Akunina [59]4 years ago
5 0

Answer:

Blood can return via deep veins:

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What step in the carbon cycle didn’t exist before the industrial revolution?
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<u><em>Answer:</em></u>

<u><em>Combustion</em></u>

<u><em>Explanation:</em></u>

<u><em>The step in the carbon cycle didn’t really exist before the industrial revolution was Combustion</em></u>

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According to most theories about the evolution of early life on earth, the atmosphere had an abundance of ammonia, methane, and
SIZIF [17.4K]

Answer:

A

Explanation:

<em>The correct option would be </em><em>A.</em>

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The water in the primitive atmosphere was formed from the condensation of water vapour from volcanoes that were characterics of the earth's environment while oxygen in itself is not needed for photosynthesis but a by-product of it.

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3 years ago
Define haploid cells, and explain how they are produced
vlabodo [156]

Answer:

Haploid cells are produced when a parent cell divides twice, resulting in two diploid cells with the full set of genetic material upon the first division and four haploid daughter cells with only half of the original genetic material upon the second.

8 0
3 years ago
The letters "RNA" stand for
tatuchka [14]
RNA stands for <span>ribonucleic acid. RNA is vital for living things to well, live!</span>
4 0
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Read 2 more answers
List and briefly describe the chemical sequence of events in the fight-or-flight response to a threatening situation from the bi
777dan777 [17]

Answer:

Binding taking place at the receptor site

G protein activates in the cell membrane

Conversion of GDP → GTP

Activation of adenylate cycles

Cyclic production of AMP → ADP

Initiation of the desired reaction in regard to the original message

Cyclic restoration of AMP → ATP

Explanation:

The description of the mechanism:

Right off the bat, epinephrine attaches to a molecule called a receptor (beta-adrenergic protein).

G protein, which is found on the inner side of the plasma membrane, is activated when epinephrine binds to it.

The GDP-carrying Alpha subunit of G protein is isolated during activation. After that, the GDP is translated to GTP.

Adenylate cyclase is then activated by GTP.

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CAMP stimulates protein kinase A, and the cycle repeats till the glycogen phosphorylase enzyme is triggered.

After that, the cyclic amp is brought back and restored.

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3 years ago
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