The correct answer is <em></em>ii.
The pharyngotympanic tube or else eustachian tube is a structure of the middle ear, which connects the nasopharynx with the middle ear. The function of this structure is to equalize the pressure and drain the mucus produced by the middle ear.
Resolving power
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Answer: the theory of evolution states that all living things we can identify descend from the Last Universal Common Ancestor. It is not that the translation process between mRNA and amino acids is universal, but that the underlying genetic code relating DNA nucleotide triplets (codons) to amino acids is the same for almost all living things.
Explanation: The genetic code ‘tells’ mRNA which the sequence of amino acids in a protein and when to stop adding amino acids. The DNA . triplets, called codons, code for 20 amino acids and a STOP signal. The code is identical in almost all cases, but there are variation, mostly found in mitochondrial DNA. But even when these variants exist, most of the code is the same as in other living organisms. For example the codon AGG normally codes for the amino acid serine but in arthropod mitochondria it codes for lysine. These very few and minor changes tend to confirm the single ancestry of the code and how well it has been conserved through billions of replications
2.525 m/s is its final speed at the bottom of the ramp when it has slide down a ramp of 1.6 m.
<h3>What is Speed?</h3>
The rate of change of position of an object in any direction is termed as the speed of that object. The distance traveled in relation to the time it took to travel that distance is how speed is defined. Given that it just has a direction and no magnitude, speed is a scalar number.
Acc. to the given data:
ΣFx = max
mg sin() = m ax (componential form)
ax = g sin()
putting, g = 9.8 and = 15 degrees:
ax=9.8 sin15
ax=9.8 0.2588
ax = 2.5 m/s2
Plug this, and xo = 0, vox= 0, and x =1.6, into the equation:
x - xo = vox t + ½ ax t2
gives:
1.6= 1.25t2
solving for t tells us that the box takes 1.01 s to slide down the ramp.
Now to find the final speed use the following equation
v=u+at where u=0
v=0+2.51.01
v=2.525 m/s
Hence, 2.525 m/s is its final speed at the bottom of the ramp when it has slide down a ramp of 1.6 m.
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The muscle fibres use several substrates in order to perform contractions. ATP is one of them. It binds to the myosin head and causes contraction. Creatine phosphate is another substrate that works in the "background" storing energy to convert ADP into ATP quickly as ATP is being used. Glycogen is another of the muscle fibres' substrates. It's used to produce energy quickly when creatine phosphate runs out of phosphates to use on ADP. The use of glycogen leads to the deposition of lactic acid on the muscles.
When these substrates run low there is muscle fatigue (or also called, in this case, metabolic fatigue) - there's no energy. Another cause may be from the deposition of lactic acid that also leads to such fatigue.
