dsnjflkdsfjldksfjklsjfkdsjfdklsjfdslfjdskljvfbkljcvxkljxzvmsfcvdnsfdojsfkljvxcnvxcvldjsfljdsfkljdsfldjsfdxvcmn,vxcncvxxcvvncxxcvnmncxvnoijsaji;jgoihnojuhjuihjuidrgfhuijhfdsoihfdoruewh,bvxc,bhdshfdsaohfasifhdishfdskdshfdhsfklkdshc,xvmxcvcvxbmnxcvbvjdsbvibdsbljbfkjkjbbkjavbkjdsakjsfbdsfkhdskjdsbfvkdsbkjdsbvbdskjbdskfbdskjdsbvfdkbvdffdkjbdksbfdsafkljbdsfljdbkgfbnfldbaskfbdsfdasbfkdljsbdfbfdsbfkjdsfkljdsfkbhdkjsbdsfkdsfkdhfskdjfbdasfkjfkjdskdskhfdlskdfskjdskfdjfhdshfdkshewurebvkvuiaeswghifoghdsdhjslhfldsfdsvnrnenrengffngnfdsgdfsgdfshdhgfhs
1.true
2.food can spend between 4 to 6 hours in the intestine
Answer:
in controlled experiment an independent variable is systematically manupulated and dependent variable is measured ; any extraneous variables are controlled
