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maria [59]
3 years ago
5

A new development involves a network of plastic tubes being printed within an organ. After the whole organ is printed, these pla

stic tubes are dissolved, leaving a network of empty tunnels.
Why does the organ need to have the empty tunnels within it?
Biology
1 answer:
d1i1m1o1n [39]3 years ago
4 0

Answer:

These are needed to mimic the blood vessels which these organs will use for the supply or drainage of fluids e.g blood.

In addition the empty tunnels serve as the routes for nutrients and oxygen supply  for the organ.

In summary the tunnels provided  a vascular structure to support the organ

Explanation:

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You measure the pH of your backyard soil and find it is 7. You measure the pH of your friend's backyard soil and find it is 4. H
olchik [2.2K]

Answer:

1000 times.

Explanation:

Hello,

In this case, since the pH is defined by:

pH=-log([H^+])

If we want to compute the concentration of hydrogen we must write:

[H^+]=10^{-pH}

Thus, for both the backyard soils we compute:

[H^+]_{pH=7}=10^{-7}=1x10^{-7}M

[H^+]_{pH=4}=10^{-4}=1x10^{-4}M

It means that:

\frac{[H^+]_{pH=4}}{[H^+]_{pH=7}} =\frac{1x10^{-4}M}{1x10^{-7}M}\\ \\\frac{[H^+]_{pH=4}}{[H^+]_{pH=7}}=1000

It means that the concentration of hydrogen at a pH of 4 is 1000 times greater than the concentration of hydrogen at a pH of 7.

Regards.

4 0
3 years ago
What have the scientific studies identified as the major cause of acid rain in the united states?.
Vadim26 [7]

Burning of fossil fuels that release sulphur and nitrogen compounds into the air is identified as the major cause of acid rain in the united states.

<h3>What are the causes of acid rain?</h3>
  • Acid Rain is created when sulphate and nitrogen oxides from the atmosphere react with rainwater and fall as a result.
  • Sulphur and nitrogen particles that mix with the wet elements of rain are the main causes in the production of acid rain.
  • Due to air pollutants, notably the excessive levels of sulphur and nitrogen released by machinery and industrial operations, acid rain is made up of water droplets that are extremely acidic.
  • The emissions that are released from industries are man-made causes.
  • The natural causes, such as lightning strikes in the atmosphere that release nitrogen oxides and volcanic eruptions that release sulphur oxide.

The complete question is :

What have the scientific studies identified as the major cause of acid rain in the United States?

a )chemicals still in the atmosphere from the asteroid collision with the earth

b) excess solar radiation due to the depletion of the ozone layer

c) volcanic ash in the air

d) burning of fossil fuels that release sulphur and nitrogen compounds into the air

To learn more about acid rain , refer:

brainly.com/question/6700006

#SPJ4

3 0
1 year ago
That addictive behaviors produce the same brain responses that follow drug abuse. in both cases, several regions deep inside the
Kitty [74]
The answer is:  "dopamine" .
__________________________________
8 0
3 years ago
Read 2 more answers
If cyanobacteria never evolved during earth's history, how would their absence affect the composition of earth's atmosphere?
Blababa [14]
Cyanobacteria, also known as blue-green algae, are found in vast quantities in fresh and salt water. Cyanobacteria are able to conduct photosynthesis. By utilising energy from the sun, they produce carbohydrates from water and carbon dioxide. As a byproduct, they produce oxygen. So cyanobacteria provided oxygen to the atmosphere that allowed other lifeforms to develop.
3 0
3 years ago
Which of the following serves as the cell's boundary from its environment
Bad White [126]
B. Cell membrane
Remember cell membrane is the structure aka “wall of the house” is the clear boundary between the cells internal and external environments:))
Hope this helps
4 0
3 years ago
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