A student thinks that birds eat the same food as squirrels. Which of the following should she do to prove her view ?
AShe should count the number of birds and squirrels in a park.
BShe should feed sugar water to each and record how much they drink.
CShe should observe squirrels and birds and write down everything they eat.
DShe should put a squirrel and a bird together in a cage for a week and observe them.