A producer <span>forms the base of food webs</span>.
        
             
        
        
        
Answer: You need a temporary variable to hold the value 3
Explanation:
So, aList[0] is 3 and aList[1] is 19, if it will be as it is you litteraly say to the compiler to change aList[0] to aList[1]  at this moment aList[0] is 19 and aList[1] also is 19 and if you try to change aList[1] to aList[0]  it will not change its value because they are the same.
You need temp variable to keep one of the values.
 
        
             
        
        
        
Answer:
  The solution code is written in Python 3
- digits = input("Enter 9 digits: ")
 - 
 - multiplier = 1
 - total = 0
 - 
 - for x in digits:
 -     total += int(x) * multiplier  
 -     multiplier += 1
 - 
 - checksum = total % 11  
 - 
 - if(checksum == 10):
 -     print(digits + "X")
 - else:
 -     print(digits + str(checksum))
 
Explanation:
Firstly, use input function to get user input for 9 digits (Line 1)
Next we can use a for-loop to estimate the summation (d1 * 1 + d2 * 2 + d3 * 3 + d4 * 4 + d5 * 5+ d6 * 6 + d7 * 7 + d8 * 8 + d9 * 9) ( Line 6-8) 
Then only apply % operator to get the remainder of total and get the checksum (Line 10)
Next create if and else statement to print the digits string joined with X if checksum is 10 else join digits string with checksum value (Line 12 -15)
 
        
             
        
        
        
Selecting the button assigned
Using the shortcut Keys assigned
Explanation:
By clicking the assigned button one can run a macro and we can assign a short cut key to macro which we created.
So, the two options we can use to run a macro.
 
        
             
        
        
        
Answer:
Fiber-optic cable
Explanation:
Before the cable industry transitioned to fiber-optic cables, for many years, the standard cables used for telephone, cable, and internet communications were coaxial cables. The transition was made possible because the architecture of the fiber-optic cable came with a higher capacity, more extensive bandwidth link. Unlike the coaxial or the twisted pair cable, the fiber-optic is made from glass strands that transmit light signals much quicker and to greater distances. This makes fiber-optic cables the fastest high capacity data transfer link than any other cables to ever exist.