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torisob [31]
3 years ago
13

Which of the following did not happen in the devonian period

Biology
2 answers:
Elanso [62]3 years ago
8 0

Answer:

The correct answer is none of the above.

Explanation:

Devonian is a geological time period, spanning 6. billion years from the end of the Silurian, 41.92 million years ago. The first known forests on Earth, rise in the Late Devonian, initiate with the evolution of Archaeopteris.

The first main amphibians evolved in the Devonian period, around 37. billion years ago, from lungfish like fish known as lob-finned fish.

The late Devonian also is known for the first four-leg vertebrates with true pods that could able to walk on land.

Thus, the correct answer is none of the above.

andreyandreev [35.5K]3 years ago
3 0

The answer is actually none of the above. The Devonian Period allowed for amphibians to evolve, as well as terrestrial vertebrate. Forests grew to cover most of the continent. All of these events happened in the Devonian Period.

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ANSWER

The correct answer is A

<u>EXPLANATION</u>

From the equation Fe + O_2 \rightarrow Fe_2O_3


<u>L.H.S.</u>               


Fe = 1                        

O  =2      

                 

<u> R.H.S</u>

Fe =2


O  =3

Now, let try to balance the oxygen atoms first,

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To get 6 atoms of oxygen at L.H.S  multiply 2 by 3 and on the R.H.S, multiply 3 by 2



L.H.S.                        

O=2\times3=6      


R.H.S

O=3\times2=6  


This means that, 3 should be in front of O_2 at the L.H.S and 2 should come before Fe_2O_3 in the R.H.S of the equation


Now, we have


L.H.S.                        


Fe = 1                          

O  =  6                        

<u>R.H.S</u>

Fe =4

O  =6

The equation is still not balanced since Fe is not balance

 

The Least Common Multiple of  1 and 4 is 4

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L.H.S.                        

Fe=1\times4=4      


R.H.S

Fe=4\times1=4  


We now, have



<u>L.H.S.   </u>                    

Fe= 4                          

O=6                        


<u>R.H.S</u>

Fe =4

O=6

Hence the balanced equation is

4Fe +3O_2\rightarrow 2Fe_2O_3




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