Biological. I thought that the answer would be evolution but that is not one of the options. I think my answer is right. I hope it is.
The word for the blank is fat.
When I had a tennis game. I was the best one on the team. I had to carry all the responsibility of us having a chance of winning against the other team was really stressful. But having that stress also made me play better so I wouldn’t let me team down.
