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Amanda [17]
3 years ago
7

The exchange of gases across a respiratory surface always occurs by

Biology
1 answer:
ivanzaharov [21]3 years ago
3 0
Inhalation or exhalation
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How does energy from the sun affect the motion of molecules in a gas compared to molecules in a liquid?
suter [353]

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Molecules of gas starts movement when they get energy from the sun in the form of heat.

Explanation:

Molecules of gas absorbed heat energy coming from sun. This heat energy is converted into kinetic energy due to which gas molecule moves faster. Volume of gas molecules also increases due to expansion of molecules by the absorption of heat energy. So more space is occupied by gas molecule as compared to liquid molecules.

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Nitrogen-fixing bacteria remove nitrogen from plants and return it to the soil. true or false?
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Parasites help the organisms that they feed on? True or false
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13. Describe the structure of a bone.
julia-pushkina [17]

Answer:

Explanation:

Bones are organs composed of hard living tissue providing structural support to the body – it's scaffolding. It is a hard matrix of calcium salts deposited around protein fibers. Minerals make bone rigid and proteins (collagen) provide strength and elasticity. ... The outer layer of bone is called Cortical bone.

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3 years ago
Describe the flow of blood from the umbilical vein to the descending aorta in the developing fetus.
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Oxygen and nutrients from the mother's blood are transferred across the placenta to the fetus through the umbilical cord. This enriched blood flows through the umbilical vein toward the baby's liver. There it moves through a shunt called the ductus venosus. This allows some of the blood to go to the liver.

A small amount of the blood continues on to the lungs. Most of this blood is shunted through the ductus arteriosus to the descending aorta. This blood then enters the umbilical arteries and flows into the placenta. The oxygen rich blood then returns to the fetus via the third vessel in the umbilical cord (umbilical vein). The oxygen rich blood that enters the fetus passes through the fetal liver and enters the right side of the heart.

To learn more about umbilical vein , here

brainly.com/question/1232134

#SPJ4

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