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pshichka [43]
3 years ago
13

Biology..please help..TYVM

Biology
2 answers:
seropon [69]3 years ago
8 0
B nucleic acids or c nucleotides
Paraphin [41]3 years ago
3 0
C. Nucleotides are what the sub-units of DNA are called. 
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A 20 fluid oz. soda contains 201 calories. how many kilojoules does the soda contain?
algol [13]
  The relation between calorie and kilo joul is  

1Cal=4.184 Kj  

1 Cal--------------------4.184 Kj
201 Cal--------------------- X Kj  
X=201*4.184/1=840.98 Kj  
<span>20 fluid oz. soda contains 840.98 Kj</span>
7 0
3 years ago
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How is modern earth different from earth over 4 billion years ago?
igor_vitrenko [27]

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5 0
3 years ago
Why are there more debates than answers when discussing stem-cell research?
julia-pushkina [17]
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Which of the following are disadvantages of mono-culture cropping?
professor190 [17]
The answers is all of the above
7 0
3 years ago
The stethoscope is a device commonly used by doctors to monitor heart function. When listening to a heart beating using a stetho
Effectus [21]

Answer:

The correct answers are:

1. closing

2. the ventricles and arteries,

3. a constricted trachea

Lub is the first sound of a heartbeat and is mentioned as S1. It is usually produced due to the closing of tricuspid and and mitral or bicuspid valves present between atria and ventricles.

Tricupsid is located between atrium and ventricle of the right hand side and mitral valve is located between atrium and ventricle of the left hand side. They prevent the back flow of blood from ventricles to their respective atria.

Dub, being the second sound is written as S2. It is produced due to the closing of pulmonary (located between right ventricle and pulmonary artery) and aortic valves (located between left artery and aorta).

These valves prevent the back flow of blood from arteries into the ventricles.

The time between the two sounds is often taken as the measure of the diastole i.e. ventricular filling.

Wheezing refers to a high-pitched sound produced when a person breathes, especially during exhale. It is caused by constriction of the airways or inflammation. It is considered as a symptom of various diseases such as asthma, COPD, allergies, bronchitis etc.

8 0
3 years ago
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