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adell [148]
3 years ago
10

How are elements that are heavier than hydrogen spread throughout the universe

Biology
1 answer:
Julli [10]3 years ago
8 0

Answer:

Elements that are heavier than hydrogen are spread throughout the universe only during a supernova explosion. It is an explosion of the stars when the star reaches its death stage. When the star is alive, the gravity of its core squeezes lighter atoms like hydrogen to make heavier atoms like carbon and helium.

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zhuklara [117]

Answer and explanation

Due to technical problems, you will find the complete answer and explanation in the attached files  

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8 0
3 years ago
One substance has no membrane transporters to move it but can diffuse freely through open leak channels if there is a concentrat
Rama09 [41]
<h2>Urea </h2>

Explanation:

Urea is a small nitrogenous compound which is the main end product of protein catabolism in mammals

  • Urea is a nitrogen-containing substance normally cleared from the blood by the kidney into the urine
  • It is made predominantly in the liver from ammonia and bicarbonate and is one of the main components of urine
  • The rate of synthesis varies from 300 to 600 mmol/day depending on the protein intake
  • All of this urea eventually finds its way into the urine
  • Because urea makes up a large part of the obligatory solute excretion, its osmotic pressure requires significant volumes of water to carry the urea
  • Urea passively crosses biological membranes, but its permeability is low because of its low solubility in the lipid bilayer
  • Some cells speed up this process through urea transporters, which move urea by facilitated diffusion
  • Urea is passively reabsorbed in the proximal tubule, but its route of transport is not clear
  • Urea transporters have not yet been identified for the proximal tubule
3 0
3 years ago
Communication between sdn controllers and routers is governed by ________.
galben [10]

Answer;

-Northbound APIs

Communication between SDN controllers and routers is governed by Northbound APIs.

Explanation;

-The northbound application programming interface (API) on an SDN controller enables applications and orchestration systems to program the network and request services from it.

-Northbound APIs can enable network functions like path computation, loop avoidance, routing and security. The northbound APIs can also used to facilitate innovation and enable efficient orchestration and automation of the network to align with the needs of different applications via SDN network programmability.

3 0
3 years ago
What type of muscle is responsible for peristalsis?
Masteriza [31]

In much of a digestive tract such as the human gastrointestinal tract, smooth muscle tissue contracts in sequence to produce a peristaltic wave, which propels a ball of food (called a bolus while in the esophagus and upper gastrointestinal tract and chyme in the stomach) along the tract.

5 0
4 years ago
Why is the open ocean considered to be a "biological desert"?
Roman55 [17]
C. There is a lack of nutrients
8 0
3 years ago
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