I think the correct answer among the choices listed above is option C. Muscles make up more than 40% of a person's body mass. However, this depends on many different factors like the age, gender and physical fitness. Hope this answers the question.
Answer from: Quest
answer; ///i believe that the correct answer is (a) specialized cells)
What is a coast of using technology to transport water? a. cities can be built in otherwise uninhabitable areas. b. crops can be irrigated and grown in new areas. c. floods can be averted in flood-prone areas. d. freshwater supplies can be depleted in an area.
Which of the following was a social cost associated with the development of the internal combustion engine used in most cars? a. people were able to use their horses for new tasks. b. new jobs were created. c. blacksmiths needed to gain new skills to continue working. d. families were able to travel farther more easily.