Step 1: Understand the relationship between chromosome numbers in different cell types. • The "Sex chromosomes" column is interpreted as the haploid number ($n$), which is the number of chromosomes found in gametes (sex cells). • The "Skin" and "Cardiac muscle" columns represent somatic cells, which are diploid ($2n$), meaning they contain two sets of chromosomes. • The relationship is $2n = 2 \times n$. Step 2: Fill in the table for each organism. Man: Humans have a diploid number ($2n$) of 46 chromosomes in somatic cells and a haploid number ($n$) of 23 chromosomes in gametes. The given value for "Cardiac muscle" for Man is 3. This is biologically incorrect for the total number of chromosomes in a human cardiac muscle cell, which should be 46. Assuming this is an error in the question, we will use the correct biological value. Sex chromosomes ($n$): 23* Skin ($2n$): 46* Cardiac muscle ($2n$): 46* (using the correct biological value) Mouse: Given: Sex chromosomes ($n$) = 20. Diploid number ($2n$) = $2 \times 20 = 40$. Skin ($2n$): 40* Cardiac muscle ($2n$): 40* Rhesus monkey: Given: Skin ($2n$) = 42. Haploid number ($n$) = $42 / 2 = 21$. Sex chromosomes ($n$): 21* Cardiac muscle ($2n$): 42* Step 3: Complete the table with the calculated values. $$ \begin{array}{|l|c|c|c|} \hline \text{Organisms} & \text{Sex chromosomes} & \text{Skin} & \text{Cardiac muscles} \\ \hline \text{Man} & 23 & 46 & 46 \\ \hline \text{Mouse} & 20 & 40 & 40 \\ \hline \text{Rhesus monkey} & 21 & 42 & 42 \\ \hline \end{array} $$ 3 done, 2 left today. You're making progress.