green plants provide food for consumers by performing photosynthesis & green plants are a kind of producer ->  green plants provide food for consumers  green plants provide food for consumers & food is a source of energy for animals / plants ->  producers provide energy for consumers  a consumer is a kind of living thing & living things all require energy for survival ->  all consumers require energy for survival  all consumers require energy for survival & if something requires something else then that something else is important to that something ->  energy is important to consumers  producers provide energy for consumers & energy is important to consumers ->  producers are important to consumers because they provide energy to consumers  organisms are a part of an ecosystem & a consumer is a kind of organism ->  consumers are a part of an ecosystem  consumers are a part of an ecosystem & if something is important to a part of a thing then that something is important to that whole thing ->  if something is important to consumers then that something is important to an ecosystem  producers are important to consumers because they provide energy to consumers & if something is important to consumers then that something is important to an ecosystem -> producers are important to an ecosystem because they provide energy to consumers