Economic systems are important because they allow people to adapt to their natural environment and produce the plant and animal foods they need to survive.
(Economic systems; are; important; because they allow people to adapt to their natural environment and produce the plant and animal foods) (people; to produce; the plant and animal foods they need) (they; allow; people to adapt to their natural environment and produce the plant and animal foods) Context(they allow,List([39, 49))):(people; to adapt; to their natural environment) (the plant and animal foods; need; to survive) Context(the plant and animal foods need,List([107, 143))):(they; to survive; )
they allow,List([39, 49)) the plant and animal foods need,List([107, 143))
Economic systems people they people the plant and animal foods they
are to produce allow to adapt need to survive
important because they allow people to adapt to their natural environment and produce the plant and animal foods
the plant and animal foods they need
people to adapt to their natural environment and produce the plant and animal foods
to their natural environment
to survive