Answer
d.
Work Step by Step
Option a. is incorrect. A consumer, by nature, eats other things. Therefore, consumers cannot get their energy directly from the sun.
Option b. is incorrect. Only first-level consumers eat primary producers such as grass.
Option c. is incorrect. Chemoautotrophs get their energy from inorganic chemicals.
Option d. is correct. Consumers must meet their energy needs by either eating organisms that are alive or those that used to be alive.
