Which of the following statements is not a cause of the global obesity burden

The cardiovascular system, which transports blood through the body, is a one-way system. select the best answer from the choices provided. t f

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

Marcus's genotype for eye color is bb. olivia has brown eyes, but she is heterozygous for the trait. what percentage of the children have blue eyes? if violet has green eyes and jonas has brown eyes, what is claudia's genotype? how many people in the family have blue eyes?