yes you are doing it right great gob
a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.
a. by using fur or clothes to trap heat energy near the body
instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully