<span><u><em>Answer:</em></u>
All of the above
<u><em>Explanation:</em></u>
Vertebrates are a class of creatures falling under kingdom "<u>Animalia</u>" that are characterized by the presence of an internal skeleton composed of bones.
<u>Vertebrates are characterized by the following:</u>
1- presence of internal skeleton
2- developed brain
3- the presence of an advanced nervous system connected to the brain
4- presence of muscles that allow movement
5- protective skin
6- circulation of blood in the bodies in the vessels
Comparing the mentioned characteristics with the options given, we will find that the most suitable answer is: <u>"all of the above"</u>.
Hope this helps :)</span>
Answer:
I think that this would be an example of erosion
Answer: A river flowing at a certain speed
Explanation: as water has certain velocity and mass.
Answer:
(a) The unit cell edge length <u>0.421 nm</u>
Explanation:
Lets calculate -:
Given -
density = 
Molecular weight of MgO = 24.31 +16
Avagadro number = 
In rock salt structure , there are four anions and four cations , hence Z=4 (Number of formula per unit cell)
Now, using the formula -
![a=[\frac{ZM}{N_Ad}]]^\frac{1}{3}](https://tex.z-dn.net/?f=a%3D%5B%5Cfrac%7BZM%7D%7BN_Ad%7D%5D%5D%5E%5Cfrac%7B1%7D%7B3%7D)
Now, putting the given values
= 0.421 nm
<u>Hence , the unit cell edge length = 0.421 nm </u>
Answer:
O=O is not a compound; it's a molecule.
