any of a large group of organic compounds occurring in foods and living tissues and including sugars
They ate carbohydrates.
and cellulose. They contain hydrogen and oxygen in the same ratio as water (2:1) and typically can be broken down to release energy in the animal body.
extend the application of (a method or conclusion) to an unknown situation by assuming that existing trends will continue or similar methods will be applicable
They tried to extrapolate the data.
steer
for example by turning a wheel or operating a rudder