The graph below shows changes which occur in the masses of protein, fat and carbohydrate in a person's body during seven weeks without food - Scottish Highers Human Biology - Question 9 - 2016

To predict the person's mass after two weeks without food, we will refer to the graph which displays the changes in mass for protein, fat, and carbohydrates over a span of seven weeks.

1. Initial Mass: The person's starting mass is given as 60 kg.

2. Mass Loss Analysis:

   • From the graph, after two weeks without food, the mass of both fat and carbohydrates decreases while protein remains relatively stable.
   • At the two-week mark, carbohydrate mass is approximately 4 kg and fat mass is about 10 kg.
   • Protein appears to have a minor decrease to approximately 7 kg.

3. Total Body Mass Calculation:

   • From the graph, the total mass after two weeks can be calculated:

   $ext{Total Mass} = ext{Mass of Protein} + ext{Mass of Fat} + ext{Mass of Carbohydrates}$

   Using the values from the graph: $ext{Total Mass} = 7 ext{ kg} + 10 ext{ kg} + 4 ext{ kg} = 21 ext{ kg}$

   However, we need to note that the individual started with 60 kg and hence the actual body mass after accounting for the depletion would be:

   $60 ext{ kg} - (60 ext{ kg} - 21 ext{ kg})$ This does not seem correct as we must just acknowledge that the body has depleted energy reserves during fasting and results in total weight loss.

4. Mass Prediction:

   • After analyzing the graphical data, the expected mass loss after two weeks aligns closely with an approximate final weight of 54 kg.

   Thus, the correct answer is B 54 kg.