D. The permain. Had the largest mass extinction
At the end of mitosis, the two daughter cells will be exact copies of the original cell. Each daughter cell will have 30 chromosomes.
Only 1- the experiment can not show a cause and effect relationship if there are more than one factors contributing to the outcome.
You didn't really provide the required table. But as a general hint, you should look at the differences between the two groups and then you can see what were the differences in amount of weight gained, amount of body fat, as well as the composition of the microbial community.
