Which of these is a reason why two different people might require different caloric intakes on a daily basis?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Which sentence is an example of a strong conclusion to an autobiography? a. i stayed after school three days in a row to practice onstage in the auditorium. b. i knew i would have to practice all week to memorize my dance for the recital. c. after the recital was over, i knew practicing was worth it, and i was looking forward to my next big challenge. d. on opening night, i danced in front of a packed auditorium.

What are the characteristics of living things