The normal human karyotypes contain 22 pairs of autosomal chromosomes and one pair of sex chromosomes.
Therefore the best answer choice is:
<span>B. 1 pair of sex chromosomes and 22 pairs of autosomal chromosomes are pictured.
</span>A karyotype is an organized profile of a person's chromosomes. Two chromosomes specify sex, XX for female and XY for male. The rest are arranged in<span> pairs, numbered 1 through 22, from largest to smallest.</span> 
        
             
        
        
        
The answer would be : b. CO(2 Down).
Hope this helps !
Photon
        
                    
             
        
        
        
Ground water usually contains carbonic acid
        
                    
             
        
        
        
Answer:
12-14 october
Explanation:
The probable period of exposure is calculated as follows:
- Know  the range of the incubation period 
- Start counting back from the days of the first case by subtracting the first number of incubation period range
-  Count back the days from the last case by subtracting the last number of incubation period range. 
- This will give a range which will be the period of exposure.
From the question,
- Incubation period range 1-15
- Date of first case = october 15
- Therefore, first date of exposure = 15 -1 = 14
- Date of last case = 22
- Therefore, last date of exposure = 27 - 15 = 12
- Thus, the range is 12-14 october which is the probable period of exposure.