The thesis by Ivy and Carl is divided by gender. What is the minimum number of columns for their data table?

To determine the minimum number of columns for Ivy and Carl's data table, we need to consider what information needs to be included.

1. Since the thesis is divided by gender, we need at least one column to indicate the gender of the individuals in the study. This is the first column.

2. We also need a column to include the data or information collected from each individual. This could be anything from survey responses to measurements, depending on the nature of the thesis. This is the second column.

So, the minimum number of columns for their data table would be two. However, this is a very basic setup and depending on the complexity of their study, they may need to include additional columns.