Hi guys! on the next paragraph which one would you consider to be the topic sentence?

Question

Paragraph 2
Body mass is made up of protoplasm, extracellular fluid, bone, and adipose tissue (body fat). One way to determine the amount of adipose tissue is to measure the whole-body density. After the on-land mass of the body is determined, the underwater body mass is obtained by submerging the person in water. Since water helps support the body by giving it buoyancy, the apparent body mass is less in water. A higher percentage of body fat will make a person more buoyant, causing the underwater mass to be even lower. This occurs because fat has a lower density than the rest of the body.

Answer 1

I think the assignment is ‘which would YOU consider to be the topic sentence?’

If you post what YOU THINK, someone might check your answer.