Organisms that use energy from the Sun or energy stored in _________________________ compounds to produce their own nutrients are called autotrophs. They are also called ________________________ because most other organisms depend on autotrophs for _______________________ and _____________________. Heterotrophic organisms that can’t make their own food may obtain nutrients by eating other ___________________. A heterotroph that feeds only on plants is called an _________________________________. Herbivores are also called _______ order heterotrophs. _________________________________ that feed on other herbivores are _______ order heterotrophs. Carnivores that feed on other carnivores are ________ order heterotrophs. A __________________________ is a simple model of how _________________ and __________________ move through an ____________________________.